Cracking at the root of the fingernail and the skin junction needs to be treated according to the cause, and common causes include dry skin and onychomycosis. Topical moisturizing preparations and medication are usually used. 1. Dry skin: the frequent use of too hot water or alkaline detergent may trigger dry skin on the hands, making the skin on the hands rough, dry, flaky, cracked and other symptoms, cracking will make the fingernail root and the skin junction cracking performance. Local topical moisturizing agents, such as vitamin E milk, petroleum jelly, etc. for relief. 2. ringworm of the nails: ringworm of the nails is caused by dermatophyte infections, manifested in the nail plate appears cloudy, thickening, separation, atrophy and other symptoms, when the symptoms of atrophy, it is easy to lead to the root of the fingernail and the skin connection of the performance of cracking. Local hygiene should be maintained, and topical amorolfine application can be used, while oral medications such as terbinafine and itraconazole should be applied. All of the above medications have adverse effects and are recommended to be used under medical supervision. Cracking at the root of the fingernail and the skin connection may also have other causes, it is recommended to go to the hospital in a timely manner to improve the examination, to clarify the cause of the disease and then give targeted treatment.