First of all, high fever in limbs is not a disease. High temperature in limbs means that your body's basal metabolic rate is high, and more energy is released in the body, which will lead to an increase in blood flow to the skin and bring the temperature inside the body to the body surface. Because the temperature of human limbs is not 37 degrees, the surface temperature of limbs is about 14- 18 degrees. If your blood circulation is good, your body is healthy and your metabolism is vigorous, then your metabolism is vigorous. Generally speaking, it is normal as long as the underarm temperature does not exceed 37.3 (underarm > 37.5 is defined as fever).