I have a discolored area on skin near my angle of the mouth it's non itchy. Also a discoloration my neck. Any suggestion?(photo)

One day i had a pimple on this area and i used an antiseptic on it . It got reddish and inflamed ..then one day it got brown discolored i am afraid it's a chemical burn i don't know I used fair and lovely fairness cream on these areas for a week but no effect

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