 [ Symptoms ] i have a itchy rash that comes and goes what could be causing this  the rash appears in different areas of my body for an example a rash showed up on my wrist and stayed a while and went away later the same day it appeared on my stomach and then on my thighs etc its itchy while it is present at one point my hands first turned red and then start to itch really bad to the point i had to wash my hands repeatedly i work in the medical field so i wash my hands a million times a day what could be causing this reaction [ Disease ] psoriasis is a chronic skin problem that causes skin cells to grow too quickly resulting in thick white silvery or red patches of skin this commonly affects skin of the scalp and over the knees and elbows but can occur anywhere on the body about 10 to 30 of people with psoriasis develop psoriatic arthritis psoriatic arthritis may develop at any age but usually affects people between the ages of 30 and 50 while the cause is not known genetic factors along with the immune system likely play a role in determining who will develop the disorder