Hard lumps on the outer thighs are commonly localized swellings, such as subcutaneous swellings, muscle or even bone swellings. Fibroids, sebaceous adenomas or lipomas are common subcutaneous swellings, all three of which are benign swellings with generally clear borders and high mobility, with fibroids being relatively hard when pressed. Sebaceous adenomas are also harder cases, and sometimes they can become infected, with localized redness, swelling, heat and pain. If it is a lipoma, it is usually not very regular, but the boundary is clear and can be moved when pressed. If it is a malignant tumor of muscle or bone, local swelling and pain are more widespread, and you can choose to do local ultrasound or X-ray, which can basically confirm the diagnosis.