Rash on the body without itching is considered to be caused by cherry angioma, syphilis and rubella and other diseases. 1. Cherry hemangioma: patients will appear in the epidermis of different sizes of pimples, nodules, mostly bright red or purple-red, can be distributed in all parts of the body surface. The cause of its development is not yet known, may be aging, genetic mutation. 2. Syphilis: The onset of syphilis is mostly related to the infection of the human body by the syphilis spirochete, and patients will have symptoms such as chancre, swollen lymph nodes, and syphilis rashes, which are mostly red or reddish-brown pimples or maculopapular rashes. 3. Rubella: Rubella patients will have cough, fever, swollen lymph nodes and reddish maculopapular rash and other symptoms, the rash can spread to the whole body. The cause of the disease is mostly related to rubella virus infection. There are many reasons why the rash is not itchy, and it is recommended that patients go to a regular hospital to clarify the cause of the disease.