Redness on both sides of the nose, there are generally two common situations, as follows: 1. If there is redness on both sides of the nose for a long time, it is often considered seborrheic dermatitis. Seborrheic dermatitis is a chronic skin disease, the onset of a long time, mostly due to the sebaceous glands secretion. The sebaceous glands secrete sebum, which has the effect of moisturizing the skin, and often feel oily skin is caused by the sebum secreted by the sebaceous glands. The sebum and sweat glands mix to protect the skin from water discharge and maintain the electrolyte balance in the body. When long-term eating spicy food, greasy food, environmental temperature rise and other reasons, the skin around the nose secretion sebum increased, the skin surface microenvironment change, flushed patches, serious time will also form skin scales, scales can also appear to fall off the skin. 2, the nose on both sides of the short-term appearance of red spots, but also accompanied by itching symptoms, mostly considered to be allergic dermatitis, need to pay attention to, life environment change on disappeared, you can adjust the living environment in time. Pay attention to the use of cosmetics after there is no slight stinging, if there is irritation should promptly stop using cosmetics.