The first of these is that the skin is a benign hyperplasia caused by friction, and it resembles a chicken’s eye. The second, the plantar warts, mainly due to excessive friction caused by the surface of the skin broken, resulting in human papillomavirus HPV invasion infection caused by the clinical performance of the hard texture of the gray-brown papules or bumps, the surface of the slight burr feeling. In clinical treatment, you can apply recombinant human interferon alpha 2b ointment with a mixture of topical application of retinoic acid ointment, or you can choose to freeze or electro-ionic cauterization for treatment.