A lot of pimples on the legs and itchy, may be related to contact dermatitis, eczema, folliculitis and other reasons. 1. Contact dermatitis: If the skin on the legs comes into contact with chemical fiber fabrics, chemical irritants and other allergenic substances, it can cause an abnormal immune response to occur in the body, leading to the appearance of many pimples on the legs, often accompanied by itching. 2. Eczema: Inflammation of the superficial dermis and epidermis caused by heredity, immunity, ultraviolet rays, mental stress, etc., resulting in erythema of the skin on the legs, on which many pimples can appear, accompanied by itching. 3. Folliculitis: leg hair follicles are infected by bacteria, which can cause local inflammatory reaction, resulting in the appearance of many localized pimples, which can be accompanied by itching. It is recommended that people with a lot of pimples and itchy legs go to the hospital in a timely manner to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.