A new patient has come to the dermatology clinic to be assessed for a reddened rash on his abdomen. What diagnostics would be completed to identify the causative allergen?
A) Skin scrapings
B) Skin biopsy
C) Patch testing
D) Tzanck smear
Ans: C
Feedback: Patch testing is performed to identify substances to which the patient has developed an allergy. Skin scrapings are done for suspected fungal lesions. A skin biopsy is completed to rule out malignancy and to establish an exact diagnosis of skin lesions. A Tzanck smear is used to examine cells from blistering skin conditions, such as herpes zoster.
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