brown, or yellowish in color as a result of air, dirt, and debris collecting beneath the nail. When a toenail is about to fall off, it may become discolored, cracked, brittle, misshapen ...

"A brown or black streak on a nail is known ... with the sheer panic that's often accompanied by seeing a discolored toenail (or a few). There are a few potential reasons that could be causing ...

It is more common in the toenails because fungi thrive in warm, moist environments like your shoes. You may have this infection if you notice symptoms like brittle and discolored nails.

People with athlete's foot are particularly susceptible. The fungus appears on the toenail as a yellowish, white, or yellowish-brown discoloration, or the center of the toenail might have yellowish ...