Black marks on both sides of the bridge of the nose can be caused by melanin deposits, acne, and infections. It is recommended to pay strict attention to sun protection, topical decolorizers, use of drugs or laser therapy to treat and improve. 1. Melaninosis: not paying attention to sun protection and being exposed to ultraviolet rays may lead to melanin precipitation under the skin. It is recommended to do a good job of sun protection measures, if necessary, external hydroquinone cream, oral tranexamic acid, reduced glutathione has a certain effect. 2. acne: black marks on both sides of the nose, can also be considered with acne such as chronic inflammation healing, the local legacy of black pigmentation changes. If necessary, through chemical skin resurfacing, laser treatment, etc., can remove localized pigmentation, but also promote the healing of the affected area. 3. Mite infection: Mite infection on both sides of the nose may lead to localized pigmentation. If there is a noticeable itching sensation, you can use topical hyaluronic acid gel to combat dry skin to relieve discomfort. Black marks on both sides of the bridge of the nose, usually pay attention to sun protection, if necessary, to the regular hospital dermatology consultation, first to clarify the cause, and then targeted treatment.