Ingrown Toenail Remover
Despite this being an educational tool designed to help people, this is probably the grossest thing I've ever seen in the App Store. Though probably no explanation is necessary, Ingrown Toenail Remover ($1) shows ultra-realistic simulations detailing how to remove bits of your misshapen toenails. If you have a strong stomach and you're feeling brave, this is apparently something you can usually do yourself. Personally, I'd still rather go to a doctor. Just looking at the pictures make me feel faint.