What Is The Treatment For Vitiligo I The Stomach?

i have vitiligo on my stomach so my doctor prescribed me to use melanocyl (methoxsalen)topical lotion.day before yesterday, i had put extra amount of it due to which my skin got burnt and has become extremely red it has tearing sensation whenever i move a bit or even when i change my posture.so i went to him regarding this problem of mine .he then prescribed me with cosvate-G ointment.but icould not find any relief and the condition has worsened.........please suggest any ointment or medicine which could improve my condition iam in great need of your help...pls reply soon.....!!!