If there is a growth of red dots on the legs, and the red dots are not painful or itchy, there are generally more possible reasons to consider the phenomenon of allergy. At present, there are more causes of allergies, and many factors in the living environment, such as dust and exposure to ultraviolet light in the air, may cause allergies. In addition, if the mosquito bites, mosquitoes release substances may also trigger the phenomenon of allergy. Therefore, if allergies occur, it is important to first understand the specific causes and to stay away from allergens. At the same time, patients can take anti-allergy drugs, such as histamines benadryl, promethazine, paracetamol, etc. Red dots on the body may also be caused by blood clotting abnormalities, such as problems accompanied by bleeding gums, such as leukemia, may be the cause of the appearance of red dots with painless symptoms. Therefore, in case of blood system disorders, you should go to the hospital for further examinations, such as routine blood tests, coagulation tests, as well as to further determine the cause of the disease and then carry out corresponding treatment.