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Contact sensitivity to lignocaine
S E Handfield-Jones1, E Cronin
1St John's Dermatology Centre, St Thomas' Hospital, London, UK.
Clinical and Experimental Dermatology
|July 1, 1993
Summary
Lignocaine is a rare contact allergen, unlike other local anesthetics. This case highlights lignocaine sensitization from topical hemorrhoid treatment, emphasizing its clinical significance.
Area of Science:
- Dermatology
- Allergology
- Pharmacology
Background:
- Local anesthetics like benzocaine frequently cause allergic sensitization.
- Lignocaine (lidocaine) is considered a rare contact allergen compared to other agents.
- Understanding sensitization patterns is crucial due to widespread anesthetic and anti-arrhythmic use.
Observation:
- A patient developed lignocaine sensitization from a topical hemorrhoid medication.
- Previous reports indicate lignocaine preparations for pruritus ani are a common cause of sensitization.
- This case adds to the understanding of lignocaine-induced contact dermatitis.
Findings:
- Contact sensitization to lignocaine is uncommon but clinically relevant.
- Topical application, particularly for anorectal conditions, appears to be a significant route for lignocaine sensitization.
- The study underscores the importance of considering lignocaine as a potential allergen.
Implications:
- Clinicians should be aware of lignocaine's potential as a contact allergen.
- Differential diagnosis of contact dermatitis should include lignocaine, especially with relevant exposure history.
- Further research may be warranted to elucidate mechanisms and prevalence of lignocaine sensitization.