Suggest Treatment For Changing Complexion Of Neck And Face

hi doctor name is chitra and i am just 20 yrs old but major problem is my face and neck color changes. M body and even my hands had a nice color but my color changes from my neck till to my face i do know what to do please suggest me a solution i am very much disturbed of this problem and also please suggest me a medicine that can available i pondicherry please help me please