From trauma to a toenail fungus, there are many reasons why you may have a black toenail. Here's what it means, how to treat ...

How to tell if you have psoriasis or ringworm as these two skin conditions look similar but need completely different ...

Medically reviewed by Casey Gallagher, MD Psoriasis and ringworm (tinea corporis) cause scaly rashes but have different causes and treatments. Psoriasis is an autoimmune condition, while ringworm is a ...