Psoriasis: Symptoms, Causes, Types and Treatment Options

Psoriasis is a chronic immune mediated disease in which skin cells are produced far faster than the body can shed them, leaving raised plaques covered in silvery white scale. It is not an infection, it is not caused by poor hygiene, and it cannot be passed from one person to another.

What makes it difficult is not the diagnosis but the course. Psoriasis comes and goes, worsens in cold and dry weather, flares under stress, and returns after treatment stops. Most people manage it for decades rather than cure it once.

This guide covers what psoriasis is, how to recognise its five types, what triggers it, and the full range of treatment available, both conventional and Ayurvedic.

In this article you will find:

The symptoms and the five clinical types
Scalp, foot and nail involvement explained
Who develops psoriatic arthritis and how it presents
What actually triggers flares
Treatment options, diet and daily care that reduce recurrence

What Is Psoriasis?

Psoriasis is a long term autoimmune condition in which the immune system speeds up the skin’s growth cycle. Normal skin cells take around 28 days to mature and shed. In psoriasis they reach the surface in three to five days, so the unshed cells pile up as thickened plaques with characteristic scale.

Chronic plaque psoriasis is by far the most common form. According to a review published in the Indian Dermatology Online Journal, plaque type disease accounts for more than 90% of all psoriasis cases.

Prevalence in India sits between roughly 0.44% and 2.8% across studies. A multicentre analysis of hospital data across Indian medical colleges reported an overall figure of around 1% of patients attending skin clinics, with wide regional variation.

Psoriasis usually begins between the ages of 20 and 40, though it can appear at any age, and it commonly runs in families.

Psoriasis Symptoms

The presentation varies by type and site, but the core features are consistent.

Skin

Raised, well demarcated red or dark plaques with clear borders
Silvery white scale on the surface, which flakes when rubbed
Dryness, cracking and sometimes bleeding at fissures
Itching, burning or soreness, though some people have no itch at all
Yellowish scales or yellow crusting, usually where the plaque has been scratched, has become greasy on the scalp, or where a secondary bacterial infection has developed

Nails

Pitting, small depressions on the nail surface
Yellow or yellow brown discolouration, sometimes described as an oil drop appearance
Thickening and crumbling of the nail plate
Separation of the nail from its bed

Joints

Stiffness, particularly in the morning and lasting more than 30 minutes
Swollen, painful joints, often fingers or toes
Pain at the heel or the base of the spine

Yellow crusting deserves attention rather than alarm. Plain psoriasis scale is silvery white and dry. When it turns yellow, greasy or sticky, it usually means one of three things: seborrheic overlap on the scalp, oil or ointment residue, or secondary infection. The third needs medical review.

The 5 Types of Psoriasis

Type	Appearance	Common sites	Notes
Plaque (psoriasis vulgaris)	Thick red plaques with silvery scale	Elbows, knees, scalp, lower back	Over 90% of cases
Guttate	Small drop shaped spots, sudden onset	Trunk, arms, legs	Often follows a streptococcal throat infection, more common in children and young adults
Inverse (flexural)	Smooth, shiny, red patches with little scale	Armpits, groin, under breasts, skin folds	Aggravated by friction and sweat, easily mistaken for fungal infection
Pustular	Small sterile pus filled blisters on red skin	Palms and soles, or generalised	Generalised pustular psoriasis is a medical emergency
Erythrodermic	Widespread redness and shedding over most of the body	Whole body	Rare, serious, requires urgent hospital care

Table: The five recognised types of psoriasis and how they present.

A sixth presentation, nail psoriasis, is often listed separately, and psoriatic arthritis is classed as the joint manifestation rather than a skin type.

Psoriasis on the Scalp

Scalp psoriasis affects a large proportion of people with the condition and is often the first site involved. It presents as thick, well defined scaly plaques that can extend past the hairline onto the forehead, behind the ears and down the back of the neck. That extension past the hairline is the clearest feature distinguishing it from dandruff.

Hair loss can occur, though it is usually temporary and caused by scratching and scale removal rather than by the disease destroying follicles.

What helps

Descaling first. Keratolytic preparations containing salicylic acid or coconut oil based scalp applications soften scale so that medicated lotions can reach the skin underneath.
Medicated scalp lotions and shampoos. Coal tar, ketoconazole where there is seborrheic overlap, and prescription steroid or vitamin D analogue scalp solutions.
Overnight oil application. Warm oil left on for a few hours before washing loosens dense scale without trauma.
Not picking. Scale removal by force triggers new lesions through the Koebner phenomenon.

In Ayurvedic practice, scalp involvement is commonly treated with takradhara, a continuous stream of medicated buttermilk poured over the forehead and scalp, alongside internal medication.

Psoriasis on the Feet and Hands

Palmoplantar psoriasis affects the palms and soles, and is one of the more disabling forms because it interferes with walking, standing and manual work. Indian epidemiological data ranks palmoplantar disease as the second most common clinical pattern after plaque psoriasis.

It looks different from plaques elsewhere. The skin thickens, cracks into painful fissures, and scale is yellowish and horny rather than silvery. Pustular variants on the palms and soles produce small sterile blisters that dry to brown spots.

It is frequently mistaken for fungal infection or for eczema caused by contact with detergents or cement. That distinction matters, because antifungal treatment does nothing for psoriasis and steroid overuse worsens the misdiagnosed cases.

Practical measures that help: thick emollients applied to damp skin, cotton socks, cushioned footwear, avoiding prolonged wet work, and treating fissures before they deepen.

Psoriasis and the Nails

Nail involvement is common and is more frequent in people who also have joint disease. Indian studies reviewed in the Indian Journal of Dermatology, Venereology and Leprology recorded nail changes in around 74% of patients, with isolated nail involvement in about 6%.

The changes reported, in descending order of frequency, were pitting, thickening of the nail plate, partial separation of the nail from the bed, thickening of the skin under the nail, yellow brown discolouration, inflammation of the nail fold, and complete separation.

Yellow nails in psoriasis are usually caused by debris building up under the nail plate, not by fungus. A nail clipping test can distinguish the two, and it is worth doing before starting a long course of antifungal tablets that will not help.

Nail psoriasis responds slowly to any treatment because nails grow slowly. Fingernails take around six months to replace themselves and toenails up to eighteen, so improvement is judged over months, not weeks.

Psoriatic Arthritis

Psoriatic arthritis is inflammatory joint disease occurring in people with psoriasis. It is the complication that matters most, because untreated joint inflammation causes permanent damage while skin lesions do not.

How common is it? A systematic review and meta-analysis of 266 studies covering more than 976,000 psoriasis patients found a pooled prevalence of 19.7%, rising to 23.8% in studies that applied formal classification criteria, meaning roughly one in four. Indian data suggests lower figures: a cross sectional study of 1,149 consecutive psoriasis patients published in the Indian Journal of Dermatology, Venereology and Leprology found psoriatic arthritis in 8.7%, and notably, 83% of those cases were being diagnosed for the first time.

That last figure is the important one. Joint disease in psoriasis is routinely missed until someone asks about it.

Warning signs to report to your doctor:

Morning joint stiffness lasting more than 30 minutes
A whole finger or toe swelling up rather than a single joint
Heel pain or pain where a tendon inserts into bone
Low back pain and stiffness that improves with movement and worsens with rest
Nail pitting alongside joint symptoms

In around 70% of patients the skin disease appears before the arthritis, which is why anyone with psoriasis should mention new joint symptoms early rather than waiting.

Psoriasis Causes and Triggers

Psoriasis is not caused by a single factor. It develops when a genetic predisposition meets an environmental trigger, after which the immune system drives an ongoing cycle of inflammation and rapid skin cell turnover.

Predisposing factors

Family history. A parent or sibling with psoriasis substantially raises risk.
Immune dysregulation involving T cells and inflammatory signalling molecules.

Common triggers of flares

Trigger	How it acts
Streptococcal throat infection	Classic precipitant of guttate psoriasis, especially in young people
Psychological stress	Among the most consistently reported triggers in both clinical practice and patient surveys
Skin injury	Cuts, sunburn, tattoos, vigorous scrubbing, producing new lesions at the injured site
Cold, dry weather	Winter worsening is typical, with improvement in summer sun
Certain medicines	Lithium, beta blockers, antimalarials, and abrupt withdrawal of oral steroids
Smoking and alcohol	Both linked to higher severity and poorer treatment response
Obesity and metabolic syndrome	Associated with more severe disease and reduced response to therapy
Infections and illness	Any significant infection can precipitate a flare

Table: Common triggers reported in psoriasis and how they act.

Abrupt withdrawal of systemic corticosteroids is worth naming separately. It can convert stable plaque psoriasis into the generalised pustular or erythrodermic form, which is why oral steroids are generally avoided in psoriasis management.

How Psoriasis Spreads

Psoriasis does not spread from person to person. It is not contagious in any form. You cannot catch it from touching a plaque, sharing a towel, using the same swimming pool or living in the same house.

What people usually mean by spreading is one of two things:

New lesions on your own skin after injury. This is the Koebner phenomenon. Psoriasis appears at sites of skin trauma, so a scratch, a burn, a tight strap, a tattoo or aggressive scale removal can produce a fresh plaque along that exact line, typically one to three weeks later. It is the reason picking at plaques is counterproductive.

Existing plaques enlarging or multiplying during a flare. This is disease activity, driven by the triggers listed above, not by transmission.

The social cost of this misunderstanding is real. Studies of psoriasis in India consistently document social withdrawal and psychological distress out of proportion to the physical severity, largely because the disease is mistaken for something infectious.

Psoriasis in Ayurveda

In Ayurveda, all skin disease sits under the heading of kushtha. Psoriasis is most often correlated with ekakushtha, described as a vata and kapha predominant kshudra kushtha, and with kitibha where the lesions are darker and rougher.

The classical description of ekakushtha matches the modern picture closely: aswedanam (absence of sweating over the lesion), mahavastu (large area of involvement) and matsyashakalopamam (scales resembling fish scales). The pattern of remission, relapse and seasonal variation that the texts note is exactly what patients report.

Ayurvedic pathology places the cause in agni. Repeated dietary and lifestyle errors, particularly viruddha ahara (incompatible food combinations), weaken digestion, produce ama, and vitiate vata and kapha, which then lodge in the skin along with rakta. Psychological stress is named as a causative factor in its own right, not as an aggravating extra.

This framework is why Ayurvedic treatment for psoriasis works on digestion, blood and stress at the same time as it works on the plaques. Our overview of ayurvedic skin health sets out the wider model.

Conventional Treatment: Creams, Ointments and Tablets

Treatment is chosen by severity, site and how much of the body surface is involved. Everything below is prescription territory. It is included so you understand what your dermatologist is proposing, not so you can select it yourself.

Topical treatment for mild to moderate disease

Category	Common actives	Used for
Emollients	Petrolatum, paraffin, ceramide based creams	Baseline care in every case, reduces scaling and cracking
Keratolytics	Salicylic acid, urea	Softening and removing thick scale before other treatment
Vitamin D analogues	Calcipotriol, calcitriol	First line for plaque psoriasis, often combined with a steroid
Topical corticosteroids	Potency graded from mild to very potent	Short courses to control flares
Coal tar	Tar creams, ointments and shampoos	Chronic plaques and scalp disease
Calcineurin inhibitors	Tacrolimus, pimecrolimus	Face and flexural areas where steroids are unsuitable

Table: Topical treatment categories commonly used in psoriasis.

Scalp lotions. Coal tar and salicylic acid shampoos, ketoconazole shampoo where seborrheic overlap exists, and prescription steroid or calcipotriol scalp solutions in a non greasy base.

Phototherapy. Narrowband UVB is standard for widespread disease that has not responded to topical treatment. PUVA is used less often now.

Systemic tablets and injections for moderate to severe disease. Methotrexate, ciclosporin, acitretin and apremilast are the oral options, and biologic injections targeting specific inflammatory pathways are used when these fail or are unsuitable. All require baseline investigations and regular monitoring, and several are unsafe in pregnancy.

Two cautions worth repeating. Long term unsupervised use of potent topical steroids thins the skin and causes rebound on stopping. Oral corticosteroids are generally avoided in psoriasis because withdrawal can precipitate severe forms of the disease.

Ayurvedic Treatment and Panchakarma

Ayurvedic management of psoriasis follows a sequence: remove the causes, correct digestion, purify, pacify, then rejuvenate.

Shodhana (purification) is the core intervention. Virechana, therapeutic purgation, is the procedure most used for kushtha, since it clears pitta and kapha from the system. It is preceded by internal oleation with a medicated ghee such as panchatikta ghrita or mahatikta ghrita, then external oleation and sudation. Raktamokshana is added selectively where blood vitiation is localised.

Shamana (pacifying medicines) continue for several months afterwards. Formulations that appear repeatedly in published Ayurvedic case literature include mahamanjishthadi kwath, panchatikta ghrita guggulu, arogyavardhini vati, gandhaka rasayana and guduchi.

Takradhara, a continuous stream of medicated buttermilk over the forehead, is widely used where scalp involvement and stress are prominent.

Rasayana, the rejuvenation phase, is what most patients skip and what most reliably prevents relapse.

What the published evidence looks like. Ayurvedic literature on psoriasis is dominated by case reports rather than controlled trials, and that limitation should be stated plainly. Within those reports, the outcomes are substantial. A case report in the Journal of Ayurveda and Integrated Medical Sciences documented a PASI score falling from 29.9 to 3.5 over four months following virechana with panchatikta ghrita guggulu and mahamanjishthadi kwath. Another documented a fall from 21.8 to 0.8 with takradhara, virechana and internal medication. A third reported PASI falling from 48.4 to 10.6 with classical virechana, alongside a marked improvement in quality of life scores.

These are individual cases, published by the physicians who treated them. They demonstrate what is achievable, not what is average. Anyone comparing Ayurvedic and conventional treatment should know that biologics have been tested in large randomised trials and Ayurvedic protocols largely have not.

Our detailed overview of Panchakarma for skin explains the procedures, the preparation and what a course involves.

Psoriasis Diet Chart

No diet cures psoriasis. Diet does influence flare frequency, severity and treatment response, largely through inflammation and body weight.

Foods to eat	Foods to avoid
Vegetables, especially bitter and green leafy varieties	Red meat and processed meat
Fresh fruit, particularly pomegranate and amla	Alcohol, which is strongly linked to severity and poor response
Whole grains: old rice, wheat, barley, millets	Refined sugar, bakery items and packaged snacks
Moong dal and other easily digested pulses	Curd, especially at night
Ghee and cold pressed oils in moderate quantity	Fish or seafood combined with milk
Turmeric, ginger, cumin, coriander	Excess sour, salty, fermented and pickled food
Omega 3 sources: flaxseed, walnut, fatty fish (not with dairy)	Deep fried and reheated oil
Warm water through the day	Black gram, sesame and radish in excess

Table: Dietary guidance combining conventional evidence and classical Ayurvedic pathya and apathya for psoriasis.

Three points carry most of the practical weight:

Alcohol. The association with severity and poorer treatment response is one of the more consistent findings in psoriasis research.
Weight. Reducing excess weight improves both disease severity and response to treatment in people who are overweight.
Meal regularity. Fixed meal times and a proper gap between meals is the single Ayurvedic instruction patients report as most difficult and most useful.

Gluten free eating helps a specific subgroup: those with coeliac disease or confirmed gluten sensitivity. It is not a general recommendation for everyone with psoriasis.

Daily Care That Reduces Flares

Moisturise heavily and often. Apply on damp skin after bathing. This one habit reduces scaling, itching and cracking more than any other daily measure.
Lukewarm showers, not hot. Hot water strips lipids and worsens dryness.
Mild cleansers. Avoid alkaline soaps and vigorous scrubbing.
Protect the skin from injury. No forceful descaling, no tight straps, care with shaving and waxing.
Sunlight in moderation. Brief regular sun exposure helps most people. Sunburn triggers flares.
Manage stress deliberately. Yoga, pranayama and structured sleep are treatment, not lifestyle garnish, in a disease this stress reactive.
Stop smoking. Linked to both onset and severity, particularly in palmoplantar disease.
Treat throat infections promptly, especially in children and young adults with guttate patterns.

When to See a Doctor

Seek prompt medical care if you develop:

Widespread redness covering most of the body, with shedding, fever or chills
Pus filled blisters appearing rapidly over large areas
Joint pain, swelling or morning stiffness lasting over 30 minutes
Signs of infection in a plaque: spreading warmth, yellow crusting, pus or fever
Rapid worsening after stopping any medicine, particularly oral steroids

Psoriasis is also linked to higher rates of cardiovascular disease, metabolic syndrome, depression and anxiety. Periodic screening for blood pressure, blood sugar, lipids and mood is a reasonable part of long term care rather than an optional extra.

Frequently Asked Questions

Is psoriasis contagious?

No. Psoriasis is an immune mediated condition and cannot be passed to another person by touch, shared towels, swimming pools or close contact. New lesions can appear on your own skin at sites of injury, a phenomenon called Koebnerisation, which is often mistaken for the disease spreading to others.

What are the 5 types of psoriasis?

The five recognised types are plaque psoriasis, which accounts for over 90% of cases, guttate psoriasis with small drop shaped lesions, inverse psoriasis in skin folds, pustular psoriasis with sterile pus filled blisters, and erythrodermic psoriasis affecting most of the body surface. Nail psoriasis is often listed separately.

What causes psoriasis?

Psoriasis develops when a genetic predisposition meets a trigger, after which the immune system drives rapid skin cell turnover. Common triggers include streptococcal throat infection, psychological stress, skin injury, cold dry weather, certain medicines, smoking, alcohol and abrupt withdrawal of oral corticosteroids.

Can psoriasis be cured permanently?

Psoriasis has no permanent cure in either conventional or Ayurvedic medicine. What is achievable is long remission with few or no visible lesions. Ayurvedic case reports document substantial reductions in PASI scores maintained over months. Relapse risk rises with stress, infection, seasonal change and returning to trigger foods.

Why are my psoriasis scales yellow?

Psoriasis scale is typically silvery white and dry. Yellow scale or crusting usually indicates seborrheic dermatitis overlapping on the scalp, residue from oils and ointments, or a secondary bacterial infection. Spreading warmth, pus or fever alongside yellow crusting needs medical review rather than a change of cream.

Do psoriasis yellow nails mean fungal infection?

Not usually. Yellow or yellow brown nail discolouration in psoriasis is caused by debris accumulating under the nail plate. Fungal infection can coexist, so a nail clipping test is worth doing before starting antifungal tablets. Nail changes improve slowly because fingernails take about six months to regrow.

Which cream is best for psoriasis?

There is no single best cream. Emollients form the baseline for everyone. Vitamin D analogues such as calcipotriol, often combined with a topical steroid, are standard first line treatment for plaque psoriasis, with coal tar and salicylic acid used for thick scale. Selection depends on site and severity and requires a prescription.

How many people with psoriasis get psoriatic arthritis?

A meta-analysis of 266 studies found psoriatic arthritis in about 19.7% of psoriasis patients, rising to 23.8% where formal classification criteria were applied. Indian data reports a lower figure of 8.7%, though 83% of those cases were diagnosed for the first time during the study, suggesting significant underdiagnosis.

Medical Disclaimer

This article is for general education and does not constitute medical advice, diagnosis or treatment. Psoriasis requires diagnosis by a qualified clinician, and treatment must be individualised. Do not start, stop or change any prescribed medicine, including topical or oral steroids, without medical supervision. Do not self prescribe internal Ayurvedic medicines. Seek urgent care for widespread redness, rapidly spreading pustules, or signs of infection.

About the Author

Dr. Belaku Chandu Senior Ayurvedic Consultant focuses on musculoskeletal disorders, digestive imbalances, autoimmune conditions and personalised Ayurvedic care. Her work reflects a compassionate, integrative approach that looks closely at the root causes behind each guest’s health concerns.