The corns and plantar warts can be identified from four aspects: etiology, site of occurrence, lesion characteristics, and conscious symptoms. 1. Etiology: corns are a physical skin disease, associated with long-term mechanical stimuli such as pressure and friction, causing excessive proliferation of the stratum corneum; and plantar warts are a viral skin disease, caused by infection with the human papilloma virus. 2. Happening parts: corns are often involved in prominent stress areas, such as the outer side of the little toe or the inner edge of the middle lesser toes, can also be seen on the back of the toes and heel; and plantar warts can occur in any part of the soles of the feet, but to the front of the palm and plantar more common, more likely to occur at the site of the trauma. 3. Lesion characteristics: corns are conical keratin plugs embedded in the skin, hard, smooth surface, yellowish or dark yellow, slightly transparent, soybean size or larger, clear boundary; lesions occurring between the two toes due to sweat impregnation, the surface becomes soft and white, so it is also known as “soft corns”. The metatarsal wart lesions are initially pinheads, rice grain size keratinized papules, gradually increasing, surface roughness, skin lines interrupted, gray-yellow or gray-brown, surrounded by a slightly higher thickening of the keratin ring. If a knife to cut off the surface of the stratum corneum can be seen milky white keratin soft core, easy to bleed and the formation of small black spots. The lesions can be single, or multiple groups, or even fused into a block. 4. Self-awareness symptoms: corns due to the keratin tip embedded in the dermis, walking or local pressure pain is obvious, that is, vertical pressure pain obvious; metatarsal warts also have pressure pain, squeeze pain obvious. If the patient has the above symptoms, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.