The nail unit is made up of the surrounding elements and the protein keratin that makes up the nail plate, which is the tough part of the nail. Numerous disorders, such as deformities, wounds, dystrophy, ingrown toenails, and infections, can affect the nails. Psoriasis, atopic dermatitis, iron deficiency, kidney failure, cirrhosis, some lung disorders, lymphedema, chemotherapy, and psoriasis...