The middle of the mouth and nose is at the bridge of the nose, which is mostly exposed to the air. Long spots are mostly seen in freckles, chloasma and age spots and other diseases. 1. Freckles, mostly brown spots of different degrees, are commonly found in women, and their factors are related to heredity, which is autosomal inheritance, and long-term sun exposure is also related to the onset of the disease. 2. Chloasma, common in women after middle age, the pathogenesis of which has no clear clinical evidence, heredity, sun exposure, hormones, etc., are closely related. 3. Age spots, i.e. seborrheic keratosis, are common benign tumors of the skin, occurring above the age of 40, and are mostly manifested as light brown or black patches or papules, mostly related to the aging of the skin. It is recommended to consult a regular hospital in time and follow the doctor’s instructions to treat the spots in the middle of the mouth and nose, and do not use medication on your own.