Red moles on the body may be caused by spider nevus, allergic purpura, hemangioma and other factors.
1. Spider nevus: it may be related to the change of estrogen level in the body, liver disease and other factors, which causes the appearance of spider nevus on the body, usually red, finger pressure on the center of the spider nevus can appear spider foot disappears, and then will appear again after releasing.
2. Anaphylactic purpura: the pathogenesis is not clear, it may be related to heredity, infection, allergy and other factors, a red rash may appear, and then red-purple petechiae will gradually form, accompanied by joint swelling and pain, abdominal distension, abdominal pain, nausea, foamy urine and other symptoms.
3. Hemangioma: the pathogenesis is not clear, it may be caused by factors such as reduced level of growth inhibitory factor and high level of pro-angiogenic factor, which may lead to localized red nevus, which is bright red at the beginning, and then gradually turns into dark purple.
It is recommended to go to the dermatology department of the hospital for diagnosis and treatment to avoid delaying the condition.