How to Measure Psoriasis severity

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Psoriasis is a very complex autoimmune disease. It has several types which range differently in severity. They can be anywhere from mild to moderate and severe.

Psoriasis involves a process in which the skin cells divide more repeatedly than the normal and form scales, lesions, and pustules. They become irritating, itchy, and painful. A silvery or white lining is formed around the patches of skin affected by psoriasis.

The cause behind this condition is believed to be an autoimmune reaction by our immune an. The T cells grasp this autoimmune response which is generated by mistake and divides into a number of cells. Neutrophils of white blood cells get divided.

These reach the upper layers of skin to guard the body against the invasion of foreign bodies. They result in the formation of pus, and excessive production of the skin cells.

These skin cells accumulate to form pustules, sores, raised bumps, lesions with pus, scales, dryness of the skin, and redness along with inflammation.

They carry on the process of inflammation as a line of defense in response to the immune attack triggered. This is the condition called psoriasis.

It is a chronic ailment, its treatments work on the impacts of psoriasis than the cure. To understand the severity of psoriasis, one should know the onset, symptoms, behavior, impacts, treatments, and ill effects of the treatments in detail.

Psoriasis severity cannot be measured on a scale. However, efforts can be put to classify it based on various factors. It depends upon how much area of spread is observed on the body, how long has it’s been, and also the symptoms of physical examination.

measuring severity of psoriasis

Tools for the determination of the severity of Psoriasis

After an assessment of your well-being, physical changes, and effects on the body, psychological changes after the disease, Redness of the skin, scales and thickness of the lesions and pustules, etc a dermatologist can conclude the severity of psoriasis.

Self-administered PASI also called a self-administered psoriasis area and severity index is the tool to self-assess your psoriasis severity. The scale ranges from 5 to 7. It can be categorized as most clear, almost clear skin, mild psoriasis, moderate psoriasis to severe, and most severe psoriasis.

Psoriasis Area and Severity Index is another tool that is very complex to use. It calculates the thickness of the raised bumps, area of the skin under psoriasis spread, the extent of scales, redness, and inflammation. These are not used for children. There is yet another measuring tool that determines the severity of psoriasis in children.

Children’s dermatology life quality index is one such. This assesses the skin wholly, from physical to psychological conditions of the child, and determines the severity scale.

PASI or psoriasis assessment severity score is also cited as a tool for the estimation of severity. While the dermatology life quality index is used for adults. When the body surface area is considered, it is early measured as the area covered by psoriasis.

how to measure severity of psoriasis

A hand covers almost one percent of the body surface area. One can use a hand to estimate how much body surface area is occupied by psoriasis spread.

Impacts of psoriasis should always be discussed honestly with the doctor. Do not neglect the effects, the stress and depression you are facing, and the emotional and psychological changes while explaining to the doctor about your flare-ups.

Where to search for the symptoms of psoriasis in the body?

Psoriasis does not confine to just skin, it reaches to nails and joints. They are destroyed entirely or partially due to this condition. The intensity measure of psoriasis depends upon the skin, scales, lesions, pustules, and raised bumps on the skin.

severity of psoriasis

In mild psoriasis, less than three percent of the body surface area is affected. There will be a single isolated patch scattered in a few places across the body. Mild psoriasis can be observed in limbs, elbows, and scalp which are more vulnerable areas of psoriasis infection.

If a topical medication can clear the skin psoriasis, with certain creams, ointments, and solutions, then it is considered mild psoriasis. This doesn’t make any drastic changes in the life of an individual. A little discomfort in social well-being is noticed in general.

Moderate psoriasis is determined if the spread of psoriasis is more than three percent and ten percent. Moderate psoriasis can be treated with topical medication, retinoid analogues, calcineurin inhibitors, light therapies like UVA, UVB, and excimer laser.

This has remarkable impacts on an individual’s lifestyle and well-being. It is not so significant as in severe psoriasis. It can be observed in-ground, torso, elbows, limbs, and head.

If this spread is not cleared by any of the mentioned treatments, it is considered severe psoriasis. If the body surface area of ten percent has been covered with the psoriasis patches, then the condition is very severe.

The treatment for this condition used very impactful drugs like cyclosporin, methotrexate, biologics, that attack the immune system are used. Light therapies like psoriasis plus ultraviolet A, broadband UV rays, narrowband UVB phototherapy, psoralen medications are given.

All the possible treatments using coal tar and salicylic acids, analogues of vitamin D to corticosteroids every aspect is utilized to clear the severe impacts of psoriasis.

[Read more about Ayurvedic Treatment for Psoriasis]

Prevalence of psoriasis

When the discussion is put on the prevalence of psoriasis, there are very fascinating facts. NCBI comes up with a study with some numbers. Most of the psoriasis cases are proved to be mild with 52 percent, while 12 percent of cases are diagnosed with severe psoriasis.

There are 36 percent cases with moderate psoriasis. The scale showed more index in mild psoriasis population, then comes the moderate and severe psoriasis.

Psoriasis is associated with chronic pulmonary and respiratory diseases, liver and renal diseases, diabetes, myocardial infarction and vascular diseases with blood vessels, rheumatoid diseases and heart strokes. These are the most dangerous threats in people with severe psoriasis.

Later on, the researchers demonstrated that even being treated for psoriasis using various treatments also has an incidence of other diseases. Cardiac strokes, myocardial infarction, diabetes, chronic obstructive pulmonary disease, peptic ulcers, damaged blood vascular system, renal and liver disease, rheumatoid Arthritis, etc are such.

Adverse effects

The symptoms for identifying psoriasis are redness on the area that is covered with the patches. In erythrodermic psoriasis, the whole body will be covered by a redness cover.

Redness is seen around the sores and inflamed areas. Irritation and itching arise around the pustules. Silvering or white lining with scales surrounds the patches of psoriasis spread.

The nails develop yellowish colour and discoloration occurs. In extreme conditions, the finger gets deformed and the nails loosen from the nail beds and fall off. In dactylitis, the fingers develop sausage-like swelling along with skin disease.

Lower back, spine column, neck, pelvic floor, etc are all affected with pain, and immobilization happens. This is called spondylitis.

The scalp develops hair fall, patches of psoriasis, silvery lining, and itching. This condition is called scalp psoriasis. Scalp psoriasis is treated with medicated shampoos containing coal tar and salicylic acid.

Psoriatic arthritis is another dreadful chronic impact of psoriasis. It can be symmetric, asymmetric, inverse, erythrodermic, etc types of psoriasis. In psoriatic arthritis, the inflammation extends in all joints of limbs and feet.


The psoriasis flare-ups make the normal life of an individual very miserable. The skin becomes itchy, bruised, and unable to bear the sores. The nail’s colour changes, the scalp sheds flakes.

Some people mistake scalp psoriasis with dandruff and neglect the treatments. This makes the hair fall and sometimes bald too. Keeping the body hydrated and moisture, regular washing of hair, etc should be done.

Taking care of the details of fingers, nails, and skin is important in psoriasis. Dressings should be done regularly for the wounds, open cuts, and injuries until they are healed.

People with psoriatic arthritis should follow a low-impact full exercise regime. Taking hot oil massages and Epsom salt baths ease the pain. Vitamin D supplements and vitamin A analogues substitute the medications.

The non-steroidal anti-inflammatory drugs like ibuprofen, naproxen, DMARDS like sulfasalazine and methotrexate are used to treat psoriatic arthritis. Biologics like interleukins 23 and 12 and interleukin 17 and T cell inhibitors are used to suppress the immune responses of the immune system.

Click to Check your Psoriasis Severity


  1. About Psoriasis – National Psoriasis Foundation
  2. Psoriasis Treatments – National Psoriasis Foundation
  3. PMC – NCBI – NIH
  4. Skin Problems & Treatments: Symptoms & Types – WebMd
  5. What’s Your Psoriasis Severity? – Healthline

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