Small Rash appears on arm after nights out

Patient

Q: Hi, For a couple of years now after nights out, the following day i get two small rashes/lumps on my arm in the same two places. Both on my right arm. it isnt painful but can itch a little bit, the rash goes down throughout the day. the rash is small red, and looks like a nettle sting, what could this be?

Symptoms:  Small rash on the arm, a little itchy
Doctor

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