Docs can you explain what is a difference between a cold sore and a fat lip?

Swollen lip: There are various reasons a lip could be swollen. One possible cause is a cold sore (fever blister).

Infection vs trauma: Cold sores (also called fever blisters.) groups of fluid-filled blisters that often erupt around the lips and sometimes under the nose or around the chin. Cold sores are caused by the herpes simplex virus type 1 and are very contagious. The initial infection (primary herpes) may be confused with a cold or flu and can cause painful lesions to erupt throughout the mouth. Once a person is infected wi.