Black spots on the calf may be caused by hyperpigmentation, stasis dermatitis, pigmented nevus and other factors, the patient should consult a doctor in time to clarify the cause of the disease. 1. Hyperpigmentation: black spots on the calf may be caused by hyperpigmentation, in the occurrence of hyperpigmentation on the calf before the occurrence of ringworm, trauma, healing epidermal or dermal hyperpigmentation caused by an increase, there are no other self-conscious symptoms, generally no special treatment, can be self-subsorbed. 2. Siltation dermatitis: black spots on the calf may also be caused by stasis dermatitis, the patient will also have varicose veins of the lower extremities, skin erythema, dry and flaky, itching. 3. Pigmented nevus: black spots on the calf may also be caused by pigmented nevus, which may be single or multiple, with clear boundaries with the surrounding skin, and can be removed by surgery or laser. The above medications and treatments should be administered under the guidance of a doctor.