Dermatology Questions? Ask an Online Dermatologist.
Thank you for your question.
This seems likely to be genital herpes particularly if you have been having unprotected sex.
I would, therefore, recommend that you be seen and tested and after diagnosis of herpes you will likely require a course of an antiviral medication rather than neosporin which does not help in herpes.
Let me know if you have more questions.
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Herpes can happen in this location even though it is not the most common location but the rash is characteristic of herpes.