noun. any of several skin disorders characterized by shedding dry flakes of skin.
1. Noun Phrase Although pityriasis rosea can occur at any point throughout the year, it appears to be most common in the spring and fall 3. 2. Noun Phrase The American Academy of Dermatology states that pityriasis rosea is a skin rash commonly found in people from 10 to 35 years of age. 3. Noun Phrase According to the American Academy of Dermatology website, the herald patch of pityriasis rosea is often mistaken for ringworm. 4. Noun Phrase If the rash appears in a small circular pattern, with smaller patches following and spreading throughout the affected areas, it may be attributed to pityriasis rosea**.