Last sunday night around 10pm I drank from a water bottle that I thought was mine. Turns out it was not. Nobody was actively drinking from it, it was probably there at least an hour or two before I drank from it. Three days later a huge painful bump showed up on my lower lip line. To me it looked like a cystic pimple which I am very prone to, I am 24 with bad acne. Since then it has shrank in size, and never changed in appearance, except it had a little tiny head on it which disappeared after applying warm compress. It never turned to a blister and never scabbed or anything like that. Yesterday (Sunday, one week after drinking from bottle) I went to my dermatologist which was about 4 days after the bump came up. She at first seemed unsure as to what it was but then said it is probaly just cystic acne. She did not seemed worried at all, and reassured me I had nothing to worry about. Then I went to a walk-in clinic and showed it to a Doctor there and he just laughed and said it was a pimple and that if it were a cold sore it would be easy to tell and again said don't worry about it. So long story made longer do you guys think it is anything to worry about, could it be herpes ?? I have been with the same girl for four years and neither of us have ever had a cold sore and ive been tested before and nothing has ever said i was positive nor her. I am a person with a lot of anxiety so I might be over thinking it. Do I have anything to worry about ? I was romantically with my Girl friend with this bump on my lip. dumb move so that has me even more scared. Any thoughts would be SO APPREDCIATED. Thanks !!