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Finger bumps
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Finger bumps

Hi I'm asking for my dad. Dad is 70 years old, and he started having this finger bump 10 days ago. At the beginning his middle fingertip in left hand hurt when touched. Then the bumps emerged at the finger tip and also at the base of that finger. Now the skin in the areas looks a little darker, like a bruise.

Dad is pre-diabetic, otherwise pretty healthy. He has lost some weight and is controling his diet and excercise. I'm not sure if the finger bumps are related to his pre-diabetic condition.

Could someone kindly help to diagnose what the problem might be?

I really appreciate your help!
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