A patient has come to the dermatology clinic with a reddened rash on his abdomen. Which of the following diagnostics would be completed to identify the causative allergen?
A) Skin scraping
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. A skin scraping is 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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