Seasonal light erythematous patches, also called peach fungus, are called seasonal contact dermatitis in Western medicine. The disease occurs on the face of women and starts as flushed or light red coin-like patches with a few small red papules with indistinct borders and a small amount of scales attached. Itchiness or dryness is felt. It is sometimes accompanied by a history of allergic rhinitis or other allergic diseases. It is often called peach fungus in Chinese medicine because it tends to flare up in the spring and can heal itself after the season. Pollen antigens are an important causative factor of the disease, and seasonal light erythema may be an IgE antibody-mediated delayed skin allergy caused by exposure to pollen antigens dispersed in the air. In Chinese medicine, the disease is thought to be caused by internal heat in the lung and stomach, combined with external wind-heat. The cause of seasonal light red patches is still unclear, children’s sebaceous glands have not yet developed, the lack of sebum on the skin surface, if excessive washing especially with alkaline soap may be one of the causes of the onset of pityriasis albuginea; in addition, sun exposure leading to skin damage may also be the cause of peach fever; some children due to picky and partial eating resulting in nutritional imbalance; dust in the air, pets (dogs and cats, birds) fur, etc. Skin contamination; mites and microorganisms that live on daily necessities (such as bedding, clothing, carpets, etc.) or on the skin of pets can irritate the skin.