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Tests and diagnosis
By Mayo Clinic staffIf your doctor suspects you have pityriasis rosea, he or she will do a physical exam, inspecting the spots that have appeared on your skin. Often, this exam is all it takes to diagnose pityriasis rosea.
In its early stage, however, pityriasis rosea can look like several other skin diseases, including ringworm, eczema, psoriasis or secondary syphilis. Your doctor may order blood tests or a skin biopsy to rule out these conditions.
