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Caterpillar stings can result in a variety of symptoms. Depending on the type of caterpillar and any allergies you may have, symptoms can be very mild or very severe. Common symptoms include: Itchiness and contact dermatitis, blisters, weals (welts), small red bumps, pain Acute conjunctivitis, if hairs penetrate the eyes Rash and hives Difficulty breathing Nausea and vomiting Bleeding and renal failure can occur after contact with the South American Lonomia caterpillar. If you develop blisters, large welts, or a rash that spreads, contact your doctor immediately. This is important, as some people can develop potentially deadly allergic reactions to caterpillar stings. Poison control can be reached at 1-800-222-1222 any time of the day or night, if you have any questions about how to treat a caterpillar sting. A poison specialist will answer the phone and provide you with recommendations about how to treat the sting site. If you have not had a tetanus booster in the last five to 10 years, you should get one within 72 hours of being stung by a caterpillar. This is because the sting/wound site may become open to bacteria and infection.
Watch for the development of serious symptoms. Contact your doctor if you experience worsening symptoms. Call Poison control for more information. Get a tetanus booster shot.