This is Dr Basu, experienced Internal Medicine Specialist.
I am here to address your concerns and provide great service.
Dry red patch suggests eczema or allergic reaction commonly.
The immune reaction causes inflammation of the spperficial skin layer.
Fungal infection is another possibility but usually associated with itching.
Genital herpes or any other infection will not look like this and also pain is a hallmark feature.
This rash can be easily treated with a steroid ointment.
Fluocinolone is favored but requires prescription.
Over the counter Hydrocortisone ointment can be tried twice daily.
Please get it checked by your doctor also.
It was my pleasure to help you today.
If I have answered all your questions, Please rate my response Excellent (click on the smiley faces) under this chat box only.
Please bookmark my profile for asking further questions!
This is the link to my profile: