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Genital herpes is a likely cause of your rash
Detailed Answer:
Hello and welcome to "Ask a Doctor" service,
I carefully read your query and also checked the uploaded image.
There are a few causes of a rash in the groin area. Generally, if a patient was exposed to unprotected intercourse the first thing to consider is genital herpes which in this case would indicate a sexually transmitted disease. It generally causes redness and blisters which latter burst and may create small round open areas of skin. These are generally painful as well (a burning sensation other than being itchy).
In this case, oral acyclovir is indicated (400 mg, every 8 hours for 5-7 days; different regiments exist, this is one of them).
Other possible causes but less likely in your case are a yeast infection or contact dermatitis. These just cause some redness and itchiness and the skin may flake as well, are not painful, and are generally not related to sexual activity.
I would recommend you to see your doctor and confirm the diagnosis. PCR test for herpes can be done using a sample from the rash. If the doctor thinks this is herpes then acyclovir (prescription drug) may be started and some tests are needed to rule out some other sexually transmitted disease such as chlamydia and gonorrhea and HIV, syphilis, Hepatitis B, etc
I hope this answers your query.
I remain at your disposal in case further medical assistance is needed.
Regards,
Dr. Antoneta Zotaj,
General and Family Physician

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