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Description

Only two venomous lizards are known worldwide: the Gila monster (Heloderma suspectum) and the Mexican beaded lizard (Heloderma horridum), both native to the southwestern United States and Mexico. Mexican beaded lizard envenomation is rare and typically produces intense local pain and swelling, with occasional systemic manifestations and no commercially available antivenom, leaving emergency clinicians reliant on supportive care and limited case-based guidance. This case describes a Mexican beaded lizard bite from a pet that produced significant local and systemic symptoms and raised concern for compartment syndrome, highlighting uncertainties regarding the role of fasciotomy in lizard envenomation.

A 51-year-old man presented 45 minutes after being bitten twice on the distal right upper extremity by his pet Mexican beaded lizard, which remained attached for approximately 30 seconds. On arrival, he reported severe localized pain and exhibited nausea, diaphoresis, hypertension, tachycardia, and marked swelling and erythema of the hand. Radiographs showed no retained teeth. Because of progressive swelling and concern for compartment syndrome at the initial facility, he was transferred to a tertiary center, where swelling extended to the forearm and pain with allodynia radiated to the right chest, prompting consultation with toxicology and hand surgery.

This case illustrates that Mexican beaded lizard envenomation can cause profound pain and dramatic soft-tissue swelling that may clinically resemble compartment syndrome yet still resolve with supportive management alone. In the absence of robust evidence or antivenom, current literature and this case support a cautious approach to fasciotomy in lizard bites, reserving surgical decompression for situations with objectively elevated compartment pressures or clear evidence of ischemia.

Publication Date

5-2026

Disciplines

Emergency Medicine

Comments

2026 Research Day Corewell Health West, Grand Rapids, MI, May 8, 2026. Abstract 1953

From Terrarium to Tertiary Center: Managing a Mexican Beaded Lizard Hand Envenomation

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