My 12 yo DD has a strange cluster or two of "crumpet holes" (it's the only way I can describe it!) on the heel of her foot. She has no other symptoms. She has no problem walking on the foot. I've looked it up on Dr Google but it doesn't look like athlete's foot or verrucas. After PE this week I will wash her trainers on a high temp this weekend! Can anyone identify it so I can avoid bothering the GP and go straight to the pharmacist instead? TIA.