There is a lump on the inner side of the heel which is painful when pressed, considering that it is related to osteophytes, Achilles tendonitis and subcutaneous tissue lesions. 1. Osteomalacia: people who walk too much, long-term exercise strain, especially the elderly are prone to heel osteomalacia. It can be manifested as a lump in the heel area and painful to touch. 2. Achilles tendonitis: common in excessive exercise, long-term strain of the Achilles tendon, can be caused by inflammation stimulation resulting in pain in the heel position, edema can be manifested as localized swelling. 3. Subcutaneous tissue lesions: subcutaneous tissue lesions in the heel area, such as lipoma or fibroma, can also be manifested as elevated lumps, accompanied by obvious pain. There is a lump on the inner side of the heel which is painful when pressed, and it is also related to other causes, so it is recommended to consult a doctor as soon as possible for relevant examinations to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.