Dark knuckles are a common occurrence and require adequate skin care
to treat them.Hands are exposed to various external factors like detergents,cosmetics,harsh chemicals and weather changes.
These damaging elements can cause dryness,skin pigmentation and skin discoloration.
There are various home remedies
like applying lemon juice on them daily for five minutes and the scrubbing gently with loofah sponge.
However you must get your blood insulin as well as blood sugar levels checked as some times insulin resistance
can cause these dark patchs.