To determine whether you have plantar warts or calluses, you need to start with the help of a professional doctor by observing the features of the skin lesions and relevant examinations. 1. Lesion characteristics: plantar warts are yellowish or brownish-yellow rough plaques, surrounded by a thickened keratin ring, after removing the keratin, there will be a soft core of keratin, surrounded by small black dots formed by broken capillaries, and the surrounding borders are clearer. Callus is hard, yellow or waxy yellow in color, and the surrounding border is not clear, for the flat or slightly elevated plaque. 2. Related examination: in order to determine whether the patient has a plantar wart or callus, if necessary, you can also follow the doctor’s advice, take a small part of the skin tissue to do a pathological section, through the microscope to observe the skin tissue hyperplasia, hypertrophy and so on to determine the condition of the disease. If you suspect that you have the above mentioned skin lesions, it is recommended that you go to the hospital in time to get a clear diagnosis and follow the doctor’s instructions to standardize the treatment.