Inner thigh bulge may be caused by lipoma, lymphadenitis, sebaceous cysts, boils and so on. 1. Lipoma: it is related to the accumulation of mature fat cells in the subcutaneous tissues within the thighs, often manifested as a raised or non-raised subcutaneous swelling with skin-colored surface, palpable lumps, and usually without self-conscious symptoms. 2. Lymphadenitis: most commonly seen in peripheral tissue inflammation or trauma to the lower limbs on the same side, resulting in inflammation of the lymph nodes in the inner thigh, often accompanied by significant pain, but with better mobility. 3. Sebaceous cyst: It is a kind of cyst formed due to the blockage of local sebaceous gland ducts in the inner thigh and the gradual accumulation of sebum, which grows slowly and usually has no obvious symptoms, and if it is secondary to infection, it will show redness, swelling, heat and pain. 4. boils: may be the inner thigh hair follicles and deep tissue around the occurrence of acute suppurative inflammation, mostly caused by Staphylococcus aureus infection, manifested as red nodules or abscesses. The inner thigh bulge may also be caused by other reasons, should be timely consultation, identify the cause of targeted treatment.