Cracked heels that are medically called heel fissures never ever look good, could be a real annoyance but as they might sometimes lead to more serious issues if they are not treated you need to take them seriously. These are more prevalent in all those who have dry skin, are overweight and use shoes with an open heel. The ideal way to treat them is simply giving your feet a little more attention by starting with a moisturizing lotion on them at least two times a day to start with for your dry skin. Once a day after it has improved will likely be enough. Try to find moisturizers or creams which have a thicker consistency. Many of them incorporate skin-softening agents, for example urea and salicylic acid that might help clear away old skin debris.
If the cracked heels don't seem to be improved by that regular use of the cream, then visit a podiatric doctor. They should take away the thicker dead skin after which if you make use of the lotion routinely after that, then that should help ensure that is stays manageable. You might give your feet additional attention before going to bed by soaking your feet for about 10 minutes in plain or soapy water. Just after drying the feet after that gently rub your heels with a foot filer or something like that to help clear away the dead skin. Apply a heavier, oil-based ointment and after that cover with a pair of thin cotton socks or silicone gel heel cup at bedtime to help the moisturizing lotion work. Also try and address the risk factors for the cracked heels. Shedding weight in the long run can help and try and get away from wearing shoes that are open in the heel region.
Most importantly, you should not ignore the dry cracked heels as you may develop deeper cracks in the dermis which in turn increase your probability of infection. When the above self-care measures don't help, discuss with your foot doctor about additional treatments you could have.