A lot of small dots on the legs may be related to eczema, papular urticaria, contact dermatitis and so on. 1. eczema: eczema is a chronic inflammatory itchy skin disease, the onset of the legs, in addition to causing patients to appear a lot of small dots on the legs of the situation, will also be accompanied by different degrees of itching. 2. Pemphigus urticaria: Pemphigus urticaria is mainly caused by mosquito bites, lesions are located in the exposed parts of the skin. When it develops in the legs, the patient will appear on the legs with a lot of small dots. 3. Contact dermatitis: contact dermatitis is usually caused by allergens or irritants in the role of skin diseases, such as pollen, smoke, animal fur, etc., and its clinical manifestations are mainly localized pimples, pimples, etc., accompanied by itching, redness and swelling and other symptoms. Therefore, patients suffering from contact dermatitis will also appear to have a lot of small dots on the legs. There are other causes of dots on the legs, it is recommended that patients go to the hospital in time to find out the cause of the disease, standardized treatment, so as not to delay the condition.