Toe jam can be a source of fascination, disgust or barely noticed. It can be a sign you need to wash your feet or rethink your choice of footwear. It can also lead to major health issues.

Toe jam, the gunk and debris between your toes, has even made it to a Beatles song.

But it was unlikely John Lennon was thinking about foot hygiene when he wrote the lyrics to the second verse of Come Together:..