My feet felt silky smooth - but cracked heels and very dry skin may require a stronger treatment.

It contains lactic acid to gently exfoliate dry skin and shea butter and jojoba oil to moisturise.

It is not normally caused by poor hygiene or dry skin, but by a fungus called pityrosporum ovale.

A final thought: oils may be supereffective for dry skin, but they're not practical to have in your handbag.

If you have very dry skin, it sometimes becomes a medical condition because very dry skin is acutely uncomfortable and may itch or become inflamed.