What Can Cause Rashes On Scrotum And Penis And Bump On The Shaft Of Penis?

I am a 22 year old male. I had sexual contact with a female about a month ago. We did not have sex though we may have had genital contact and she performed oral sex on my unprotected. I had not taken a shower after the oral sex for about a week and a half. About a week and half after contact and after not showering i noticed one bump on the head of my penis. I also got tonsilitis. I talked to a doctor and he said it was nothing to worry about and it healed in a week. About a week after that i noticed a rash on my scrotum which spread to my whole penis. There has been itching and slight burning sensation but no pain at all when i urinate. It has come and gone over the last few days and only recently i noticed one small painless red bump on the shaft of my penis. Could this be herpes? Or do i have a bacterial infection?