What does pityriasis rosea look like? what kind of characteristics are specific to something like pityriasis rosea?

P rosea: The first sign is a single patch on the skin called a "herald" or "mother" patch. It feels scaly. People who have fair to olive-colored skin will see a pink or rose-colored patch. In people who have dark skin, the color varies from violet to dark gray. Within a week or two, more patches will appear that are smaller. The patches may form a 'christmas tree' pattern on the back.

Distribution: Spares the face, hands, & feet. Can be itchy, especially first 3 weeks. Lasts 1 to 2 months. No treatment except lotion for itch.

Flaky red bumps: Oval shaped flaky bumps (called plaques) spread all over the body and extremities. On the back, it distribute in christmas tree fashion. Usually pr would have a first big lesion ("mother lesion" or herald patch) presents on next or arm/thigh. Never involve face. It usually happens after "silent" viral infection. It will be over in 6~8 weeks without treatment.