Find possible causes of numbness or tingling in hands based on specific factors. Check one or more factors on this page that apply to your symptom. Numbness or tingling. 1  Affects both hands. 2  Affects one hand.  Is intermittent.
These cells produce melanin, the substance that gives skin its color. Skin with too much melanin is called hyperpigmented skin. Skin with too little melanin is called hypopigmented skin. Pale skin areas are due to too little melanin or underactive melanocytes. Darker areas of skin (or an area that tans more easily) occurs when you have more melanin or overactive melanocytes. Bronzing of the skin may sometimes be mistaken for a suntan.
Hyperpigmentation â Melasma. When dark pigments seem to appear on the skin, it is known as hyperpigmentation. This is because, the skin starts producing more melanin, which is a pigment responsible to give skin its color. Hyperpigmentation can also be termed as dyschromia or increased pigmentation.There are certain areas of skin wherein melanin is produced in excess, resulting in formation of deposits, which result in producing skin patches that are darker than the skin in the surrounding area.yperpigmentation can also be termed as dyschromia or increased pigmentation. There are certain areas of skin wherein melanin is produced in excess, resulting in formation of deposits, which result in producing skin patches that are darker than the skin in the surrounding area.