Cracked heels which are medically called heel fissures never look good, can be a real nuisance but as they may occasionally result in more serious concerns if they are not treated you have to take them seriously. These are more prevalent in all those who have dry skin, are overweight and wear footwear that have an open heel. The best way to address them is just giving the feet a little more attention by beginning with a moisturizing lotion on them at least twice a day to start with for that dry skin. Once a day after it has improved will likely be enough. Seek out moisturizers or creams which have a thicker consistency. Some of them contain skin-softening agents, for example urea and salicylic acid which may help remove old skin debris.
If the cracked heels are not improved with that frequent use of the cream, next see a podiatric doctor. They are going to take away the thicker dead skin and then if you make use of the ointment routinely after that, then that should help keep it under control. You might like to give your feet some extra attention before going to bed by soaking the feet for around 10 minutes in plain or soapy water. Just after drying the feet after that lightly rub your heels with a foot filer or something similar to help remove the dry skin. Use a heavier, oil-based lotion and after that cover with a pair of thin cotton socks or silicone gel heel cup at bedtime to help the moisturizer work. Also try and address the risk factors for the cracked heels. Shedding weight over the long term will help and try and steer clear of using shoes which are open in the heel area.
Most importantly, don't neglect the dry cracked heels as you may develop deeper fissures in the skin which will raise your probability of an infection. When the above self-care steps don't help, talk with your foot doctor concerning other treatments that you could have.