Red spots on the body may be caused by nevus erythematosus, erythema multiforme, lupus erythematosus, syphilis rash and other factors.
1. Nevus erythematosus: nevus erythematosus is a kind of congenital capillary malformation, often appearing at birth or shortly after birth, the cause of which is still unclear, and manifests itself as a light red, dark red or purplish-red patch of varying sizes.
2. Erythema multiforme: it is an acute inflammatory skin disease, which can be caused by infection, drugs and other related factors, and is commonly seen in the skin of the face, neck and distal extension of the limbs, which manifests itself as target-shaped or iris-shaped erythema, which can be dark red or greenish-purple in color, and is often accompanied by mucous membrane damage, and is prone to recurrence.
3. Lupus erythematosus: it is an autoimmune disease caused by autoimmune abnormality, the typical damage to the skin is butterfly-shaped erythema on the cheeks, and the lesions can involve multiple organs and systems, which can be manifested as fever, arthralgia, hematuria, headache, chest pain and other symptoms.
4. Syphilis rash: it is a rash caused by syphilis spirochete, commonly seen in second-stage syphilis, which can occur in face, trunk, limbs and other parts of the body, manifested as macular rash, papules, etc., mostly accompanied by fatigue, weakness, hair loss and other symptoms.
Erythema on the body may also be caused by other reasons, such as hemangioma, anaphylactic purpura, etc. Patients are advised to seek timely medical attention in order to clarify the cause of the disease and carry out targeted treatment.