Hi! I'm 29 years old male and I have had a small lump on the underside of my penis about ha;f way down the shaft. It really didn't bother me until a few years ago when it inflamed and I was diagnosed as having a sebaceous cyst. I was given an antibiotic and after a few days, the swelling subsided. However, a few days ago it happened again and I can't remember the name of the antibiotic given to me by my doctor a few years back. I have already moved to a different country so I can't contact my old doctor. Does anyone know what antibiotic is used for an infected sebaceous cyst?