my skin is slightly darker than the rest of my face near the sided of my face and starting from just below my nose to my chin. The area described later is the one where i actually sweat alot. other than that i also have skin whitening on my cheeks and forehead. this whitening is usually preceded by slight pain. i also have spots resembling wrinkled skin on my legs and arms. i have 2-3 bigger white spots on my chest and stomach. about  15 days back i observed similar marks on my neck. i have undergone homeopathic as well as allopathic treatment for the same but it is to no avail. some doctors say ots due to excessive swaeting some say its because the skin pores are clogged. the facial spots have same texture as the normal facial skin but the ones on my body are wrinkled or making a shallow dip into the skin. the facial spots become more prominent in summers. please help. i am 24 i have had this trouble since 18 years of age.