A black patch on the forehead from a curling iron perm may leave behind hyperpigmentation. Due to the high temperature of the curling iron, the skin in the forehead area may be burned accidentally when the hair is permed, especially the tissue in the epidermal area may necrose and form a black piece of dead skin. If left unprotected, bacterial invasion may cause secondary infection, and repeated friction may also cause the skin to fall off, exposing muscle or bleeding. At this point, the affected area needs to be protected from water or other contamination. If the area becomes infected, medications such as erythromycin ointment and fusidic acid cream can be applied to promote healing. If a deeper red mark is left after scabbing, hydroquinone cream and other medications can be applied to reduce hyperpigmentation, and laser treatment can be performed if necessary. The forehead was curling iron hot black piece should actively seek medical treatment, strictly comply with the doctor’s instructions treatment.