The causes of cracked and hardened palms include eczema, tinea cruris, and dry skin. 1. Eczema: Eczema on the hands due to internal and external stimulation of various factors, especially chronic eczema, there will be hyperkeratosis, mossy, flaky, cracked and so on. It can also be manifested as cracking and hardening of the palms of the hands. 2. Ringworm: due to the hand skin is caused by fungal infection, especially keratinized scaly ringworm, can also lead to cracking and hardening of the palms. 3. Dry skin: when the skin of the palm of the hand is often in a dry environment or often in contact with laundry detergent, detergents and other chemicals, will damage the skin barrier, so that the skin is dehydrated, the oil is reduced, which will lead to dry, hardened and cracked skin on the hands. The phenomenon of cracking and hardening of the palm of the hand, please consult a doctor in time, after clarifying the cause of the disease for targeted treatment.