Hi Doctor, I Would Like To Ask That Why My

Hi Doctor,

I would like to ask that why my face skin become darker, I noticed this for the last 1 year, I checked with doctor he said that because of the hair color which I used that is the cause for my skin become dark also very important when I got suiting I felt little itching on face skin .
Please advise that how my skin will be bright same like before and whta is the cause for this issue many thanks