Herald Patch Evaluation
The evaluation of pityriasis rosea begins with a brief history and physical examination.
Physical findings in someone with pityriasis rosea may include a rash:
- Usually starts with one round patch
- Pink or salmon colored patches
- Patches are oval in shape
- Usually forms pattern on the skin that looks like a Christmas tree
- The rash may cover a large area of skin
The diagnosis of pityriasis is made on physical exam. Rarely, blood tests may be necessary to exclude syphilis, which causes a rash similar to pityriasis rosea.
Tests that may be used to evaluate pityriasis rosea include:
- VDRL blood test
Continue to Herald Patch Treatment
- Karnath B, Hussain N, Bevin M. Pityriasis rosea. Appearance and distribution of macules aid diagnosis. Postgrad Med. 2003 May;113(5):93-4, 97. 
- Stulberg DL, Wolfrey J. Pityriasis rosea. Am Fam Physician. 2004 Jan 1;69(1):87-91.