Poisonous asp caterpillars are back: What Houston residents need to know to stay protected

If you’ve noticed fuzzy, leaf-like caterpillars around trees this season, you might have run into asp caterpillars — insects that look cute but can cause a lot of pain if touched.

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Asps typically hang out on oak, elm, and citrus trees, and they often fall on people or pets, leading to painful stings that can last an hour or more.

Dr. Amelia Averyt, a family medicine physician with Kelsey-Seybold, explains that unless you actually see an asp, it can be hard to know what caused the pain.

Asps tend to cause more intense pain than other bug bites, and some people may experience allergic reactions like abdominal pain, itching, or nausea.

“If you get stung, wash the area with soap and water right away,” Dr. Averyt says. “Ice can help reduce swelling and pain.”

Taking an antihistamine such as Benadryl or Zyrtec can also help, according to Averyt.

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To prevent getting stung, Averyt recommends wearing loose, long-sleeved shirts and pants when you’re outdoors, especially around trees and brush where asps live.

If you or your pets experience severe symptoms like trouble breathing or a widespread rash, seek medical help immediately, as some people may experience a severe allergic reaction to these insects.


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