S: WHO – (last access: 24 November 2020); NPF –  (last access: 24 November 2020).

N: 1. 1680s, from medical Latin psoriasis, in Late Latin “mange, scurvy,” it comes from Greek psoriasis “being itchy,” from psorian “to have the itch,” from psora “itch, mange, scab,” and related to psēn “to rub”.
2. Psoriasis is a chronic (long-lasting) disease in which the immune system works too much, causing patches of skin to become scaly and inflamed.
3. There are several types of psoriasis, including:
– Plaque psoriasis. The most common form, plaque psoriasis causes dry, raised, red skin patches (lesions) covered with silvery scales.
– Nail psoriasis. Psoriasis can affect fingernails and toenails, causing pitting, abnormal nail growth and discoloration.
– Guttate psoriasis. This type primarily affects young adults and children.
– Inverse psoriasis. This mainly affects the skin folds of the groin, buttocks, and breasts.
– Pustular psoriasis. This rare form of psoriasis causes clearly defined pus-filled lesions that occur in widespread patches (generalized pustular psoriasis) or in smaller areas on the palms of the hands or the soles of the feet.
– Erythrodermic psoriasis. The least common type of psoriasis, erythrodermic psoriasis can cover your entire body with a red, peeling rash that can itch or burn intensely.
– Psoriatic arthritis. Psoriatic arthritis causes swollen, painful joints that are typical of arthritis.
4. Psoriasis is common and affects about 1 to 5% of the population worldwide. Light-skinned people are at greater risk, whereas blacks are less likely to get the disease. Psoriasis begins most often in people aged 16 to 22 years and aged 57 to 60 years. However, people in all age groups and races are susceptible.

S: 1. OED – (last access: 24 November 2020). 2. NIAMS – (last access: 25 November 2020). 3. MAYO – (last access: 25 November 2020). 4. MSD – (last access: 25 November 2020). 5. PEOPLE – (last access: 25 November 2020).


CR: arthritis, cankerous, herpes zoster, lesion, mange, papule, trauma, ulcer.