The black mark after frostbite is pigmentation, you can wait for it to subside naturally, or promote it to subside by topical medication, laser, etc., and you need to pay attention to sun protection in daily life. Frostbite partial healing of the face may be due to hyperpigmentation left black marks, with the extension of time can gradually fade, but if the black marks are serious may be difficult to completely subside on their own. Frostbite black marks, can be used topically 2% hydroquinone cream, 20% azelaic acid cream, retinoic acid ointment, etc., can also be applied locally fructic acid chemical peeling, and combined with oral or static injection of aminomethylcyclic acid, glutathione and other drugs, can help to lighten the pigmentation, so that the black marks become lighter, fade away. If the symptoms are serious, the black marks can be removed by laser treatment, which breaks up the melanin particles through the principle of light and heat and is discharged or absorbed. The specific medications and treatments mentioned above should follow the doctor’s instructions, and daily attention should be paid to avoiding strong sunlight, so as not to aggravate localized hyperpigmentation.