User:Mr. Ibrahem/Pityriasis rosea

Pityriasis rosea is a type of skin rash. Classically, it begins with a single red and slightly scaly area known as a "herald patch". This is then followed, days to weeks later, by many smaller scaly spots; pinkish with a red edge in lighter skin and grayish in darker skin. It typically lasts less than three months and goes away without treatment. Sometime a fever may occur before the start of the rash or itchiness may be present, but often there are few other symptoms.

While the cause is not entirely clear, it is believed to be related to human herpesvirus 6 (HHV6) or human herpesvirus 7 (HHV7). It does not appear to be contagious. Diagnosis is based on the symptoms. It may look similar to Tinea corporis, viral rash, pityriasis versicolor, nummular eczema, seborrheic dermatitis, psoriasis and secondary syphilis. Certain medications may also result in a similar rash.

Evidence for specific treatment is limited. If itchy or inflamed, a steroid cream or moisturiser may be applied. Steroids by mouth or aciclovir may be considered in severe cases. About 1.3% of people are affected at some point in time. It most often occurs in those between the ages of 10 and 40. There may be more cases in spring and autumn. The condition was described at least as early as 1798.