Redness, swelling and seborrhea on both sides of the nose may be caused by seborrheic dermatitis or rosacea. It is recommended to make a clear diagnosis and apply topical medication under the guidance of a doctor, together with oral medication if necessary. 1. Seborrheic dermatitis: Seborrheic dermatitis tends to occur in areas where sebum is overflowing, such as the sides of the nose, resulting in localized flushing, itching and greasy flaking. It is recommended to go to the hospital, under the guidance of the doctor to be tacrolimus ointment and other calcium-modulated neural phosphatase inhibitors, hydrocortisone butyrate ointment and other glucocorticoid drugs applied topically. 2. Rosacea: Rosacea is an inflammatory disease that occurs in the middle of the face and may cause flushing, papules, and pustules on or around the nose. It can be treated with oral medications such as isotretinoin, minocycline hydrochloride tablets, hydroxychloroquine, etc. under the supervision of a doctor. Topical azelaic acid, fusidic acid, benzoyl peroxide and other drugs. It is recommended to pay attention to local cleanliness and hygiene, reduce the intake of greasy sweets, spicy and stimulating food, combined with the doctor’s advice of medication, can promote recovery.