There are a lot of red dots on the feet may be purpura, allergies caused by eczema, etc. More sensitive people by mosquito bites on the feet may also appear a lot of red dots. 1. Purpura: Purpura is a purplish-red, indelible rash caused by subcutaneous or submucosal hemorrhage, purpura, including allergic purpura, pigmented purpura dermatosis, etc., red dots on the feet of the clinical consideration of allergic purpura, and infections, food, drugs, and to actively look for causative factors, such as prevention and control of upper respiratory tract infections, to remove the infected foci, and to avoid taking suspected medications or foods. 2. Eczema: Eczema caused by allergy is not only manifested as a lot of red dots on the feet, but also accompanied by intense itching. Patients can go to the hospital for allergen testing and avoid contacting allergenic substances in daily life. 3. Small red dots left after mosquito bites can usually subside quickly and do not need to do more treatment. Red dots on the feet may have other causes, if the symptoms continue to be unable to relieve, you should go to the hospital in a timely manner to find out the cause of the disease and active treatment.