Hi, I have gone through your query. From your symptoms it seems that you are suffering from perineum infection. It can be due to many reasons and you have not mentioned any other associated condition like: Diabetes mellitus Donovanosis Fournier s gangrene Herpes simplex HIV infection Nummular eczema Sexually transmitted disease Syphilis Tinea pubis You can get back to me with other history or consult a local dermatologist for clinical examination. Keep the area clean and dry. Local application of antifungal ointment containing clotrimazole can help if it is a fungal infection, which is most common. You can contact me on my page http://bit.ly/DrGaurav Wish you a good health.