A 65-year-old male with history of chronic back pain started on buprenorphine patches for pain management 1 week ago.
A 65-year-old male with history of chronic back pain started on buprenorphine patches for pain management 1 week ago. He reports ongoing itchiness around the patch and noticed the following rash when he removed the patch earlier today.

Which of the following is the next best investigation to confirm diagnosis?
Select the SINGLE most appropriate option from the list below. Select ONE option only.
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