Many people get a rash from poison ivy, poison oak, and poison sumac. This rash is caused by an oil found in the plants. This oil is called urushiol (you-ROO-shee-all).

The itchy, blistering rash often does not start until 12 to 72 hours after you come into contact with the oil.

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Impetigo (im-peh-tie-go) is a common skin infection, especially in children. It’s also highly contagious.

Most people get impetigo through skin-to-skin contact with someone who has it. Children and athletes like wrestlers and football players often get it this way.

It’s also possible to get it by using something infected with the bacteria that cause impetigo. You can get it from an infected towel or sports equipment. Wearing infected clothing is another way to get impetigo.

Warts are common benign growths (not cancer). Warts are caused by the human papillomavirus. They are contagious and spread easily.

Many people get a wart when they have skin-to-skin contact with someone else who has a wart. You also can get a wart by touching something that touched another person’s wart, such as a towel or locker room floor. You cannot get a wart from touching a toad or a frog.