Salicylic acid burn. What should I do? (photo)

I have hair loss so I had used minoxidil 10% and salicyclic acid in my scalp for last 4 weeks . now i had a white mark in my upper face skin and my doctor prescribed me Clindamycin and nicotinamide skin gel for to apply in effected area i used that skin gel for last 2 weeks but i cant see any chenges to the white mark but that mark is effected in more areas ...... please help me what i do ? is the skin gel is use full for me ? how can i get normal skin tone