Small red dots on the chest without pain or itching may be caused by cherry angioma, thrombocytopenic purpura, scarring and other diseases. 1. Cherry angioma: the cause of the disease may be related to genetic mutation, aging and other factors, mainly manifested as papules or nodules with a diameter of 1~5mm, bright red or purple-red in color, which can be distributed in all parts of the body and usually have no self-conscious symptoms. 2. Thrombocytopenic purpura: the cause of the disease may be related to genetic, immune and other factors. The patient’s skin or mucous membranes will appear pinpoint-sized bleeding spots, usually no conscious symptoms. 3. Scarring: due to their own physical condition, proliferative scarring after trauma, the initial stage will also be manifested as small red dots on the chest without pain or itching. There are many reasons for small red dots on the chest that are painless and itchy, so it is recommended that you go to a regular hospital for a checkup to clarify the cause of the problem.