If there is a piece of hardening in the middle of the forefoot, consider cuticle hardening, corns or bony bumps. 1. Hardening of the stratum corneum: after a long time of walking or long-term labor, the plantar skin rubs against the ground, which can lead to damage to the skin surface, followed by repair, repeated skin damage and repair, a thick skin stratum corneum will be formed, and there is no special discomfort in general. 2. Corns: a kind of foot keratin hyperplasia dermatosis caused by foot and shoe extrusion, flat and round, usually localized pain when walking. 3. Bony bumps: due to incorrect walking posture, or inappropriate external forces lead to bone hyperplasia of the foot bones, due to the bony bumps on the top of the plantar skin, can be touched in the palm of the foot hardened skin. If there is a piece of hardness in the middle of the forefoot, it is recommended to actively consult a doctor for treatment under the guidance of a physician.