The leg fork usually refers to the location of the groin, where bumps may be caused by eczema, dermatitis, enlarged lymph nodes, and lipomas. It is recommended that patients actively go to the hospital to seek medical attention, and can follow medical advice for targeted treatment. 1, eczema: eczema may be caused by genetics, immune abnormalities, microbial infections, environmental, psychosocial and other factors, which may lead to bumps inside the leg fork, while there may be a certain itchy feeling; 2, dermatitis: dermatitis may be contact, inhalation or ingestion of allergic substances, may also be mosquito bites, mental factors, etc. If the lymph nodes are all over the body, if the lymph nodes are swollen due to bacterial or viral infection in the leg fork area, it may show up as bumps inside the leg fork; 4, lipoma: lipoma may be caused by chronic inflammatory stimulation, or it may be caused by abnormal lipid metabolism. It may be caused by chronic inflammation or abnormal lipid metabolism, which can be touched by the appearance of bumps under the skin.