Splits in the skin round the heel is usually both unpleasant and painful. This issue is caused by the thick or dry skin, on and round the edges of the heels. The skin on the feet is frequently more dry and dehydrated than the skin in other places on the rest of the body probably because there are no sebaceous glands in the thicker skin on the soles of the foot. Because of this, the skin around the heels may lose suppleness and elasticity as a result of that deficiency of moisture. As a result of the loads of walking, that dry skin can begin to split and it can lead to nasty, painful cracked heels that may occasionally bleed. There are a number of reasons which raise the chance for the cracked heels such as higher loads, increased bodyweight, poor fitting footwear (especially shoes that are open at the back), inherited genes, unhygienic conditions and inadequate self-care, and dietary inadequacies.
In order to avoid cracked heels, always attempt to use properly fitted enclosed shoes which allow the feet to breathe and avoid shoes that are open at the back. It is very important to remain well hydrated by drinking at the very least two litres of water every day as that can help. Exfoliate your skin regularly and moisturise every day with a decent cream. Should it be more serious, this should probably be carried out twice a day at first. You will find recommendations that omega 3 and zinc nutritional supplements might help (however they really do need to be used with all the other solutions and not in isolation). It will also help to stay away from too much exposure of the feet to water or damp conditions. It is necessary that you wash your feet with warm water instead of very hot water. If these types of approaches don't help, then visit a competent podiatrist. They can remove the thicker hard skin and give additional advice on how to self manage.