I'm experiencing blackening of skin and dryness of akin around the ankle and foot with no pain. what could be the problem and treatment?

Rubbing: Be sure your shoes are not rubbing, do you have swelling maybe that can cause dark discoloration. Did you bump the area that could cause a slight bruising. It is difficult to say without seeing it. When it gets wet does it look better? If continues I would get it checked out.

Yes, it could be: Swelling and discoloration can come from many problems including venous disease. dermatologic conditions, arthritic conditions, and neurogenic issues. You will need a more specific diagnosis before a treatment could be suggested