If the skin is cracked and painful Calendula cream is very helpful.
For children try a footbath twice a day with one drop of Lavender, two drops of Tea tree oil for children or Add 1 drop lavender oil and 2 drops tea tree oil to 1 teaspoon of carrier oil or olive oil. Stir gently to mix and apply with cotton swab.
It is important to clean repeatedly around the toenails and fingernails as the minute fungus can lodge under the nails and cause repeated infections.