Bug bites are unpleasant and can range from harmless to dangerous, especially for those with allergies. Knowing how to identify them “could be the difference between life and death.” Here’s how to recognize two of the most common ones.

Mosquito bites usually appear as small, round bumps or slightly larger, elongated welts depending on how long the mosquito fed. They’re “extremely itchy, and scratching them will only make the itch worse.” Using ice or anti-itch cream can help reduce irritation.

Flea bites are distinct because fleas “generally bite multiple times in the same area.” These bites are tiny, firm, red, and very itchy, often found on legs or ankles. Pets or infested carpets are typical sources, so treatment should include cleaning and vacuuming your home.

Even though most bug bites heal on their own, some may lead to allergic reactions or infections. If swelling spreads, or symptoms like dizziness or trouble breathing occur, medical help should be sought immediately.

Being able to spot and respond to these bites helps you “stay prepared in a potentially high-risk situation” — an important step toward keeping yourself and your loved ones safe outdoors.