Red dots on the body that do not hurt are a relatively common clinical manifestation in daily life. There are many reasons for red dots on the body without pain and itching, and the main reasons often seen in clinical practice are the following. For example: 1. Allergic dermatitis. If the patient is exposed to allergenic substances, such as pollen, dust or food, causing generalized erythema, papules, etc., the skin will appear painless red dot patches. 2, insect bite dermatitis. After the summer insect bites, it is easy to get red dots or bumps on the body. 3, angioma. Older people, pregnant women and children may have spider-like hemangiomas that spread in all directions with red dots as the center. 4, Phase II syphilis rash. The only patient with stage II will have red dots all over the body that are not painful and will disappear again after some time.