my son has a blood blister on his eye lid. The doctor said that he most likely had a scratch there and the blood coagulated and instead of scabbing it formed a blister. the blister is not going away and the doctor said it could fall off itself but it may take years. has anyone heard of this before? any suggested treatment? do I need to go to a plastic surgeon to have it removed or can a dermatologist do this in his office?