Of all the creepy crawlies that can leave you with a nasty bite , spiders might be the creepiest.

Thankfully, most spiders can't bite humans and aren't harmful. The bad news, though, is that a few species of spider can be especially dangerous — even deadly — if their bites aren't recognized and treated promptly.

With the help of spider bite pictures and treatment tips, you can get better at identifying them — and knowing when to actually worry.

"The truth is that most spiders are too small to bite us, including those adorable jumping spiders," Jody Gangloff-Kaufmann, Ph.D., tells TODAY.com.

Some larger species of spider, such as wolf spiders and fishing spiders, can get aggressive. If provoked, they might even bite humans, but their bites aren't dangerous to people.

If bitten by one

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