Fungal toenail infections can start slowly and be hard to notice in the early stages, since they don’t cause much pain or discomfort. As the condition worsens, the toenails will become more brittle, thicker, and yellowing or graying will occur.
A painful ingrown toenail often affects the big toe, but your other toes may also be affected. Some people have a predisposition for developing ingrown toenails and this can be exacerbated by wearing tight-fitting shoes.
Improperly cut toenails can grow into the soft skin at the edge of your toe, causing swelling, redness, and possibly infection.