You may be having post burn hyperpigmentation
It is always better to consult the doctor for any of the ailments, atleast when you intend to start any medication.
If you feel that the medicine is causing problem then you must stop it immediately. Avoid sun exposure in strict sense. Apply emollient
over the affected area.
Consult a dermatologist
for proper treatment.
Dr. Ajit Singh Kulhari
MD -Skin & VD