Thanks for posting your reply.
I can understand your concern.
It seems like contact dermatitis. Maybe to a condom or lubricant that you may have used. It doesn't look like an allergy to the medications, but such a possibility can be kept in mind.
I would recommend application of hydrocortisone cream twice a day for three days. This should resolve it.
If it persists even after 3 days, it will be best to visit your dermatologist, so he can physically examine and opine.
Please let me know if you have any queries.