Children with recurrent fever and rash may suffer from measles, rubella, Kawasaki disease and other diseases that can cause rash. 1. Measles: Children with measles usually develop a rash about 3 days after the onset of fever, starting from the back of the ears and the face, spreading from top to bottom to the trunk and limbs, lasting for about 3 to 4 days, and the characteristic white, tiny measles mucous membrane spots can be observed in the oral mucosa. 2. Rubella: In rubella, the rash appears 1 to 2 days after the onset of fever, starting from the face and neck and spreading rapidly over the trunk and limbs within 1 day, but there is no rash on the palms of the hands and feet. 3. Kawasaki disease: also known as cutaneous mucocutaneous lymph node syndrome, is an immune disease, when the duration of fever is more than 5 days, we need to consider this disease, and its rash can be distributed in many places, manifested as erythema multiforme and scarlet fever-like rash. Kawasaki disease damages the blood vessels of the heart and can cause coronary artery aneurysms to develop, requiring surgery in severe cases. Children with repeated fever rash, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.