Hi..thanks for writing here.In any case of burn there is initial a blister formation,which fades away and developing either a black spot or a white patch as in your case.You can just start applying placentrex gel in morning followed by sun exposure and momate cream at night along with a multivitamin tablet daily at night,for one month.If there is slight pigmentation in it then continue with placentrex gel four days in a week and momate cream 2 days in a week till complete repigmentaion occurs,but if still no repigmentation after one month then better consult a dermatologist .You can also go for surgical treatment like punch grafting or suction blister directly if you want faster results. Take care.