pityriasis rosea
Pronunciation: pit-ih-RYE-uh-sis ro-ZEE-uh
A self-limiting inflammatory skin condition characterized by a herald patch followed by a generalized eruption.
Full Definition
Pityriasis rosea is a benign, self-limiting inflammatory skin condition that typically affects children and young adults. The classic presentation begins with a solitary 'herald patch' - a large, oval, scaly lesion usually on the trunk - followed 1-2 weeks later by a generalized eruption of smaller, similar lesions arranged in a characteristic 'Christmas tree' pattern along skin tension lines. The condition is thought to be viral in origin and typically resolves spontaneously within 6-8 weeks without treatment.
Usage
Usage note: Include description of herald patch and distribution pattern for complete documentation.
In Context
- "The herald patch of pityriasis rosea was identified retrospectively after the generalized eruption developed." — Pediatric dermatology consultation
- "Pityriasis rosea was suspected based on the characteristic Christmas tree distribution of lesions." — Clinical assessment note