It is highly natural but it usually occurs when you are not cleaning that area effectively in the shower every day. Try using a pumice stone or scrub and scrub that area every day.
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saadia (0):
hi im saadia i am an art teacher since 18 years. i have to do lots of work with paints spray card papers cutting and cutter work. now i have seen my knuckles are becoming very dark. i used lots of best hand lotions and homemade recipes but not effective.please add a comment
Whenever you move or use your hands, your knuckles always rubbed in every surface around. It is the same as the knees, it always rubbed in different surface that makes it darker compare to the other parts of the body.