Suggest Treatment For Tingling And Burning Sensation In The Groin Area

I have a tingling almost burning sensation in my groin area that now moved to my penis and seemingly urethra. I started to get a rash pimple like bumps that were on my thighs and buttocks. These bumps were quite irritating and somewhat painful. I went to the doctor and he diagnosed it as folliculitis saying the bumps did not look concerning and prescribed daily use of clindamycin phosphate. About a week or more later I began to experience muscle pain in the back and legs basically the sciatic nerve. After some 4 to 5 days this pain resided and some of the rash bumps actually went away but a couple more appeared one near my knee and one on my inner thigh. When I apply pressure these bumps sting and feel sort of hard. Now a day or two after the sciatic pain passed I have a tingling burning feeling in my genitals, but no burning while urinating. I also noticed some bumps underneath the head of the penis and on the shaft both are on the underneath part and are so tiny you can barely see them. I have been masturbating more than usually the last couple days too.