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I have a black discoloration on the left corner of my bottom lip. It doesn't itch but it burns alot. It feels swollen but it's not. The discoloration has been there for about 1 year and the burning has been there for 2 months and seems internal with no physical signs of a blister. I've been on Lipitor and Toprol for over 5 years. I don't know if this could be a side effect. Any ideas/suggestions? I am 53 years old.
burning discomfort and discoloration, no physical sign of blister
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