Bumps at the corner of the mouth are usually pimples/folliculitis rather than herpes cold sores, which are usually more toward the center of the lip. I recommend that you apply bacitracin or neosporin ointment once a day, leave the spot alone, and photograph it in case you want to show the photo to your dermatologist at some point.
Best.
Dr. Rockoff
Doc, I have a pic of will you take a look and render an opinion...not a diagnosis? also, is it possible to attach or past a pic in the message box?