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Generalized pustular psoriasis or drug-induced toxic pustuloderma? The use of patch testing
L R Whittam1, S H Wakelin, J N Barker
1St. John's Institute of Dermatology, St. Thomas' Hospital, London, UK.
Clinical and Experimental Dermatology
|March 25, 2000
Summary
Generalized pustular psoriasis can mimic drug reactions. This case highlights amoxycillin-induced pustular eruption in a psoriasis patient, confirmed by patch testing for delayed hypersensitivity.
Area of Science:
- Dermatology
- Clinical Immunology
Background:
- Pustular psoriasis is a severe dermatosis.
- Differentiating it from drug reactions can be challenging.
Observation:
- A patient with chronic psoriasis developed a generalized pustular eruption.
- The eruption coincided with amoxycillin exposure.
Findings:
- Patch testing confirmed amoxycillin as the trigger.
- A delayed hypersensitivity reaction was identified.
Implications:
- Amoxycillin can induce severe pustular reactions in psoriasis patients.
- Diagnostic patch testing is crucial for differentiating drug reactions.