Regular foot care is extremely important to prevent dry and cracked heels. You can share photos of them during consultation so that they can be reviewed and the correct treatment prescribed for it. There are several creams available that soften and smooth out the foot skin. Meanwhile use a good moisturiser and wear good footwear.
Don't worry...you are suffering from psoriasiform dermatitis causing this cracks... Specific medicine available for good control... Treatment depends on the severity..Do direct online consultation for detailed prescription by sending photos.
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