If it is a sudden growth of many red dots on the body, a variety of possible causes need to be considered. Red dots on the body may be caused by purpura due to thrombocytopenia. This condition first requires timely systematic examination to identify the cause of thrombocytopenia and then timely therapeutic intervention. The sudden appearance of red dots all over the body may be caused by allergic factors, mainly due to contact with some substances that cause allergies, or allergies caused by eating food or drugs, this situation needs to be treated with antihistamines, such as oral loratadine. The sudden appearance of many red dots all over the body may also be a symptom of heat rash, also known as prickly heat, caused by high temperatures or confined environments and other factors, you can use prickly heat powder to improve the symptoms.