Perhaps seeing the doctor is embarrassing, but there's the chance that the doctor can stop it. It's definitely worth it. Doctors have seen all kinds of body-related things. You won't be judged, ridiculed, or any of that. The doctor's job, what he or she is hired to do and has trained for years to prepare for, is dealing with cases like this. Tell the doctor ASAP. It's not fun, but if they can do something, it's worth it.