ELI5: Explain Like I'm 5

Nail disease

Nail disease is when there is something wrong with a person's nails. Nails are the hard and flat things on our fingertips and toes. They help us pick things up, scratch ourselves, and protect our fingertips and toes. When there is something wrong with our nails, it can hurt or be uncomfortable.

One type of nail disease is called a fungal infection. It happens when germs called fungi grow under your nails. These germs like warm and moist places, so they can grow in sweaty shoes or damp socks. Fungal infections can make your nails thick or discolored, which means they can look yellow or brown.

Another type of nail disease is called nail psoriasis. It happens when your immune system (which helps keep you healthy) attacks your nails by mistake. This can make them look bumpy or thick. Sometimes, nails with psoriasis can even fall off.

Ingrown toenails are another type of nail disease. This happens when the edge of a toenail grows into the skin next to it. It can be painful and make your toe look red or swollen. Ingrown toenails can happen if you cut your toenails too short, wear shoes that are too tight, or stub your toe.

Lastly, a condition called Beau's lines can also affect nails. It happens when your body is very sick or goes through a big change, like having a baby or starting chemotherapy. This can make a dent or groove across your nail, like you made a scratch on it.

If you think you have a nail disease or if your nails look different than usual, it is important to talk to a grown-up or a doctor. They can help you figure out what's going on and how to take care of your nails.