I have a sebaceous cyst at my upper back since 2004. It got infected 4 years ago and was oozing a smelly pus. I visited a medical center and the nurse practitioner prescribed antibiotics and referred me to a dermatologist who, incidentally, was just about to retire. The dermatologist advised against further treatment and that I should stop bandaging it. Recently, the cyst has gotten bigger, tender and itchy and at this stage, I won't mind a surgical intervention. What's your advice please.