Red dots on the body of patients with hepatitis B may be spider nevi. Spider nevus refers to a sign of cirrhosis that is more likely to appear on the forehead and front of the neck. It is not just a red dot, but a red dot as the center, accompanied by small blood vessels branching outward. When a small object such as a pencil is pressed against the red dot in the middle, the color of the outwardly radiating blood vessels will fade or even disappear, and when lifted, the blood vessels will become clear again, which is typical of spider nevus. This is typical of spider nevus. Generally, because the inactivation of estrogen is weakened in cirrhosis of the liver, endocrine metabolism abnormalities are caused, so spider nevus will appear. When acute hepatitis is more serious, this phenomenon may also occur. Therefore, if a patient with hepatitis B finds a spider mole, he should have liver ultrasound and liver function tests to determine the condition of his body.