Take Photos: A biopsy is a procedure that entails removing a tissue sample (in your case skin) & can only be performed by a trained medical professional. Rashes require visual inspection to diagnose & unfortunately diagnosing a fleeting rash can be challenging. Suggest you take photos or video at next outbreak & bring to your doctor for review. Also note duration, frequency, other features (eg.itching, etc).
Answered 9/2/2014
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