Dense red spots on the calves may be caused by factors such as purpura, eczema, etc. Patients should consult a doctor in time to clarify the cause of the disease and then treat it. 1. Anaphylactic purpura: Dense red spots on the lower legs may be caused by anaphylactic purpura, which is a common vascular metamorphic disease. Patients may also have arthritis and abdominal pain and other manifestations. It is a common vascular metabolic disease. 2. Eczema: the legs have dense red spots may be caused by eczema, the patient’s lesions are mostly erythema, papules, papules, symmetrically distributed on both sides, accompanied by itching and oozing, you can use loratadine, cetirizine and other medications for treatment. It is recommended to actively seek medical advice to clarify the cause of the disease. All of the above drugs should be used under the guidance of a doctor.