Female, 20+, showed up with this skin lesion which grew to b | Figure 1

Female, 20+, showed up with this skin lesion which grew to be like this during the day. There is a blister with fluid. Before it was just a small spot. She didn't scratch it, no history of allergies, it's the only lesion. This is the second time this has happened, also close to that area but on the other surface of the arm. She also said she started a new job 4 months ago, at a restaurant. Any ideas?

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