Cold sore/Zit: A cold sore is caused by the herpes simplex virus while a "zit" is a clogged sweat gland that may become inflamed. Both can cause uncomfortable sores on the face. However, cold sores are typically on the lips or inside the mouth while a "zit" is located anywhere where a sweat gland can get blocked. The other difference is a cold sore is contagious while a "zit" is not.
Answered 3/10/2018
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