Can a Woods lamp detect bacterial infections?

A Woods lamp can detect certain bacterial infections. Here are some key points to consider:

### Detectable Bacterial Infections
- **Erythrasma**: Caused by *Corynebacterium minutissimum*, this condition presents as a coral-red pigmented rash in skin folds. The rash fluoresces coral-red under a Woods lamp due to the production of coproporphyrin III.
- **Pseudomonas Infections**: *Pseudomonas aeruginosa* infections, commonly associated with burns, onycholysis, and interdigital spaces, can be detected by the green fluorescence they emit under a Woods lamp. This green fluorescence is due to the secretion of pyoverdine, a phosphor.
- **Trichomycosis Axillaris**: A superficial bacterial infection in the armpit area, often associated with *Corynebacterium tenuis* and other diphtheroid species, displays a pale-yellow fluorescence under the lamp. The exact source of this fluorescence is unknown but is thought to be related to gluelike concretions.
- **Progressive Macular Hypomelanosis**: Caused by *Cutibacterium acnes*, this hypopigmentation disorder mimics conditions like tinea versicolor. Under a Woods lamp, it fluoresces an orange-red color in pilosebaceous follicles.

### Limitations
- **Negative Results**: A negative Woods lamp test does not completely rule out bacterial infections, especially when caused by non-fluorescent species.
- **False Positives**: Substances like deodorants, makeup, or soap residue can cause false positives by fluorescing under UV light.
- **Requires Training**: Proper interpretation of Woods lamp findings requires training and experience to avoid misdiagnosis.

Conclusion
The Woods lamp is a valuable tool for detecting certain bacterial infections, particularly those that fluoresce under UV light. However, it should be used in conjunction with other diagnostic methods for accurate diagnosis, especially when results are equivocal or the case is complex. Proper interpretation requires training and clinical knowledge.

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