The red marks on the bridge of the nose should be considered to be caused by a variety of conditions. First, consider the possibility of lupus erythematosus. The cause of lupus erythematosus is not yet known and may be related to genetic factors, sex hormones, and environmental factors. UV radiation, infectious factors, such as EBV infection, and certain drugs, such as isoniazid, biologics, and methyldopa, can also lead to lupus erythematosus. Second, consider the possibility of solar dermatitis, which is mainly caused by excessive UV exposure, mainly medium-wave UV, and also related to individual skin properties, such as white, tender and thin skin is more likely to appear. Also, consider the possibility of tinea corporis, which is mainly caused by fungal infections, and common fungi include Trichophyton rubrum, Microsporum ferrugineum, and Microsporum canis.