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there appears to be loss of the top layer of skin and some excoriations...this could be from fingernails or teeth. the exposed skin is more vulnerable, of course, to secondary bacterial infection, so the topical antibiotic is reasonable.
This is unlikely eczema as it would not appear so suddenly and typically itches a lot. It is not likely fungal either for the same reasons. As fungi can sometimes take advantage of breaks in the skin in the groin region, using the clotrimazole cream is also reasonable. If this is trauma with a secondary bacterial infection (accounting for the odor perhaps) it should improve with careful topical care and antibiotics. While less likely an STI, if the sex was unprotected, it would be wise to be tested for the usual culprits 2-3 weeks after possible exposure.
How are your lesions doing? Any improvement? Let me know if you have any follow up questions. I would happy to help further.
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