Why does Abe have acne?

I know what it is just curious if they can be this bad?

 

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It's a copper plating issue.. Many tiny plating bubbles.

 

I know just had to post it ok I have a 2003 Lincoln cent that looks to have a WAM but the back of the coin is in rough shape how can I try to clean this without harsh cleaning

 

Too much fried food.

 

That looks like it has seen better days.

 

Zinc pennies will rot if exposed to high humidity. Yours looks like the zinc inside has been exposed somehow to environmental moisture and the zinc is reacting in a corrosive manner beneath the thin copper plating.