Red spots on the body of hepatitis B are generally considered to be caused by spider nevi, liver damage and skin diseases. 1. Spider nevus: Hepatitis B patients with spider nevus, belonging to a kind of hepatitis and cirrhosis-induced loss of compensation state, need to be further examined, the examination items include hepatitis B DNA, liver function tests, routine blood tests, liver fiber four tests and coagulation function tests. 2. Liver damage: liver damage or liver dysfunction can also cause skin red spots, and liver damage leads to weakened inactivation of estrogen by the liver, causing endocrine metabolic abnormalities. 3. Skin diseases: such as skin allergies or eczema, can also cause skin red spots, which are usually accompanied by itching symptoms. It is recommended that patients need to go to the regular hospital to receive further examination, according to the results of the examination, to clarify the cause of the disease, under the guidance of specialists in the treatment.