Sorry for late reply and inconvenience.
Thanks for all these additional information.
I understand your concern.
Well as you describe, chances of STD on buttock are very less likely.
Now I would recommend some self-care measures like
Do warm water sitz bath with betadine solution twice a day for 5-10 minutes.
And afterward, apply OTC 1% hydrocortisone cream mixed with bacitracin ointment twice a day.
Clean the area with DIAL soap and use OTC Abzorb powder afterward.
You should avoid frequent washing.
And keep the area dry and clean.
Wear loose-fitting cotton clothes to prevent friction.
Take OTC Motrin and Claritin for few days.
If your symptoms persist then see a dermatologist for further evaluation and management.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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