There are many reasons for the hard dead skin on the edge of finger nails, such as onychomycosis, keratosis pilaris, excessive friction and so on. 1. Nail groove inflammation: often pull out the barbs, trimming nails, cuts and other factors, may cause the nail groove inflammation, due to inflammation stimulation, it will cause the finger nail edge of the phenomenon of hard dead skin. 2. Keratosis pilaris: keratosis pilaris is mainly due to fungal infections, fungal infections continue to metabolize and reproduce, forming a certain stimulus for the fingernail skin, which will lead to the phenomenon of hard dead skin on the edge of the fingernails, and also accompanied by itching. 3. Excessive friction: patients with long-term physical labor, long-term exposure to irritating substances, can also lead to the phenomenon of hard dead skin on the edge of the finger nails, due to long-term excessive friction of the skin on the edge of the nails, resulting in the thickening of the stratum corneum, thus causing hard dead skin. There are many reasons for the hard dead skin on the edge of the finger nails, if you can’t get relief for a long time, it is recommended to go to the hospital in time, and take standardized treatment under the guidance of the doctor.