It can be distressing to wake up with a mysterious swollen red rash on your ankle. Could that rash be an insect bite? And what kind of bug bit you? The answers aren't so easy to figure out.

And how to tell if that little welt is turning into something more ... Minn., reactions to insect bites fall into three categories: 1. Normal Reaction When insects bite or sting, they commonly ...

Insect and spider bites can cause small lacerations, swelling, skin discoloration, blisters, and other symptoms. Home treatment may relieve symptoms but some bites may need medical attention.