Red spots on the face may be caused by urticaria, ringworm, psoriasis and other factors. 1. Urticaria: If the patient’s face is exposed to sunlight for a long time, it will lead to an increase in skin sensitivity, which will cause the skin to release active substances, cause the vascular permeability of the skin mucous membrane to increase, leading to the exudation of plasma and tissue fluid and the formation of urticaria, which will cause the patient to have the symptom of red spots on the face, and at the same time, accompanied by itching. 2. Tinea corporis: dermatophytosis is usually a fungal infection that occurs in the superficial parts of the skin, mainly due to the infection of red trichophyton and plaster-like microsporidium. When the dermatophytes come into contact with the skin of the face, they will adhere and colonize the local skin, thus penetrating the cells of the stratum corneum and continuing to grow and multiply, so that the patients will have the symptom of erythema on the face and will be covered with scales. 3. Psoriasis: If the patient’s parents suffer from psoriasis, the patient may inherit the genes of the parents and suffer from psoriasis, resulting in the symptoms of erythema on the face. When patients have red spots on their faces, they need to go to the hospital for examination in time, and after clarifying the cause of the disease, they should choose the appropriate method of treatment under the guidance of the doctor.