hi,i have very bad dark skin under my eyes,how to treat it? before this i ve got an allergy reaction to moisturizer cream,it makes my skin dry and itch mostly at the angle of mouth and chin..then after taking some medication its subside,but it recur mostly during winter period without using the cream.my skin became dry and scaly.later on it became darker compare to other area of my face,how to bleach this dark skin?