When you see a black spot under your toenail, you may assume that it’s due to wearing black socks. Sometimes material gets trapped inside the nail – it happens. But after you wash your feet, and your nail still has markings or discoloration, it likely means that you have toenail fungus or an injury.  Can black socks cause toenail fungus? No, but dirty or unwashed black socks can cause fungus. A fungus grows rapidly in warm, […]