There are many causes of a lump on the calf, and scar tissue is determined by whether there is a history of trauma. In addition, bumps can also be caused by soft tissue tumors, folliculitis or eczema. 1. Scar tissue: If the calf has been traumatized, the scar tissue after recovery may produce localized bumps, which can be better judged by touching the hard texture. 2. Soft tissue tumors: usually benign lipoma, fibroma, hemangioma or lymphangioma and other benign lesions of soft tissue, rarely malignant tumors, such as sarcoma, this type of tumor needs timely diagnosis, examination and treatment. 3. Folliculitis: folliculitis caused by inflammation of calf hair follicles, this type is very common, and it will be cured within a few weeks after the onset of the disease. 4. Eczema: Eczema is a skin disease, related to personal constitution, environmental changes and contact with allergens, etc. In addition to the appearance of bumps on the surface, there are itching and redness and swelling and other symptoms. Do not rule out other causes of a pimple on the calf, it is recommended to timely to the hospital, clear causes, standardized treatment under the guidance of the doctor.