Psoriasis is a common chronic skin condition that affects approximately 2% of the population. There does appear to be some genetic influence to developing this condition and several factors may worsen the rash. Smoking and obesity have been linked to psoriasis. You cannot catch or spread psoriasis to other people.
Psoriasis is a red scaly rash that most commonly involves the scalp, elbows, knees, hands, feet, and buttocks. Sometimes psoriasis can involve joints that can lead to a painful condition known as psoriatic arthritis. There are many successful treatment options for psoriasis.