Skin whitening Cream Leaves Its Own Large Darkening Patches? (photo)

hello.... nearly two years ago i used a spot removing cream to remove a scar on my face, for some days the scars seemed to be gone but after some days nearly after one month a larger brown coloured patch appeared on my right side of cheek....and it doesn't go watevr medication i do, i think i have got a severe chemical burn.... i want to kno is there any medication to remove this scar in an effective way, plz suggest. thanx..

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