I just finished a chapter on the integumentary system. It would be easier if you had a picture, as it could be a number of things. It sounds benign though.

Could be a mole, could be a papule, could be a brown patch of skin...Kinda sounds like a papule, it's basically just an elevated spot on your skin that can be brownish in color and can crust or have scales.

It does not sound cancerous though.