Good afternoon mam my daughter 11.5 years her neck was black I met many doctors they gave an ointment but still now black is there

A. Make a mix of besen and malai applied on that area leave it for 5 to 6 minutes and then you can scrub it make it little hard so that it becomes dry if you do it regularly twice a day within 10 to 15 days you will see some better men into that area