Red bumps on legs that hurt when touched may be related to folliculitis, sebaceous cyst infections, boils and so on. 1. Folliculitis: due to bacterial infection, individual patients may also be caused by fungi. During the course of the disease, a single hair follicle or multiple hair follicles become inflamed, which causes pain or burning sensation in the hair follicle area. 2. Sebaceous cyst infection: sebaceous glands are blocked during excretion, resulting in a gradual increase in the contents, epithelial swelling and the formation of storage cysts. When it is infected, it will cause redness, swelling and pain. 3. Boil: an inflammation of the skin caused by Staphylococcus aureus and Staphylococcus epidermidis infections. At first, small red, swollen and painful hard nodules appear locally, so it will be painful to touch. Red bumps on the legs that hurt when touched can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for relevant examinations, with the help of the doctor to clarify the cause, and targeted treatment or therapy.