You may be having allergic contact dermatitis
It seems that you may be having allergic contact dermatitis. There may be some cause. It may be clothes,soap,detergents,some oil,dust,condom,vaginal fluid of your spouse..etc
like methyl prednesolone in tappering dose. Take a short course of antibiotics. Take antihistaminic like levocetirizine
till you feel better. Apply antibiotic cream initially for few days then apply steroid cream with antibiotics. Avoid soap bath. Take Sitz bath in dettol
water. You may feel good. But take treatment under supervision of dermatologist
I hope you got my answer. Still, you may ask if you have any query.
Thanks with best wishes.
Dr. Ilyas Patel MD