Due to sweating in humid conditions,der is itching in certain areas in legs and hands resulting in burning sensation. White heads and black heads gets formed in d affected areas. As a result d area turns into blackish. Again during winter or rainy season it disappears. Slowly its spreading into more areas. Most prominent during hot and humid conditions and specifically during sweating. Whiteheads are more. During rainy season it soothes and d areas turns a bit blackish but no itching or white/black heads.