Diseases of the Toenails: [Causes & Best Treatments] There are 50+ possible diseases of the toenails and fingernails! Common Types #1)toenail fungus, #2)ingrown toenails and #3)bruised toenails. Look: Yellow & green toenail fungus can be improved with a few simple treatment changes. We are foot doctors & we see this problem get better almost every … Read more