A lump growing on the outside of the calf without pain or itching may be lipoma, sebaceous cyst, dermatofibroma and so on. 1. Lipoma: a tumor of normal fat-like tissue, due to abnormal proliferation and differentiation of subcutaneous fat tissue, slow-growing, usually without pain or itching, may lead to a lump on the outer side of the calf without pain or itching. 2. Sebaceous cysts: they are retention cysts caused by obstruction of excretion of sebaceous glands and are not true tumors, which can also lead to a lump on the outer side of the calf without pain or itching. 3. Dermatofibroma: it is a benign skin tumor caused by the proliferation of skin fibroblasts and collagen cells, with slow growth and brown or brown nodules on the surface, which can also lead to a lump on the outer side of the calf without pain or itching. A pimple on the outside of the calf, does not hurt, itchy, there may be other reasons, you need to go to the hospital in time to check, clear the cause of the disease, follow the doctor’s instructions for standardized treatment.