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Summary
Injectable bovine collagen (Zyderm) skin tests may show positive results up to six weeks post-administration. Delayed positive reactions necessitate a minimum six-week observation period for accurate Zyderm allergy assessment.
Area of Science:
- Dermatology
- Immunology
- Allergy Testing
Background:
- Injectable bovine collagen (Zyderm) is used for cosmetic and reconstructive purposes.
- Assessing potential allergic reactions to collagen implants is crucial for patient safety.
Observation:
- Two patients developed positive skin test reactions to Zyderm six weeks after its administration.
- One patient's positive reaction was confirmed upon repeat testing.
Findings:
- Delayed hypersensitivity reactions to injectable bovine collagen can occur.
- Skin test results for Zyderm may not be immediate and can manifest later.
Implications:
- A minimum observation period of six weeks is recommended for Zyderm skin tests.
- Clinicians should be aware of delayed reactions when interpreting Zyderm skin test results.
- This finding impacts allergy testing protocols for collagen-based dermal fillers.