What Is Pityriasis Rosea?
7. Diagnosis
The appearance of the herald patch alone is often enough for the diagnosis to be made clinically. This means that the doctor is able to diagnose the condition from a brief examination only. However, the rash can be similar to the rash caused by ringworm, so it may be necessary to perform some tests to confirm the diagnosis.
If the doctor is unsure of what the cause is, they may request a biopsy of some infected skin. This can then be sent to a laboratory where it can be examined for signs of ringworm. If ringworm is not found, the doctor will be able to confidently diagnose the condition as pityriasis rosea.
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