How do insect bites cause cellulitis?

How do insect bites cause cellulitis?

Everyone has some amount of dirt and germs underneath their fingernails — even when fingernails look clean. When you cause an opening in the skin by scratching an itchy insect bite with your fingernails, germs on your skin or under your fingernails can enter.

Children who spend a lot of time outdoors playing may be more prone to getting cellulitis this way. But it can happen to adults, too. Even if you don’t scratch, the tiny opening from the insect bite can let germs in.