I constantly itch on my hips, buttocks, inner thighs and scrotum. The itching has turned into small red bumps with no discharge. However, I did get a larger bump on the shaft of my penis and two on my buttocks. The bumps are hard and have no discharge. This happened to me about two and a half months ago, and while my doctor didn't completely agree that it was scabies, he still prescribed Permethrin. This helped, and I washed everything in my home. Now it is back. Could this be an STD, and not Scabies?