How do you interpret the fluorescence patterns observed under a Woods lamp?

When interpreting fluorescence patterns observed under a Woods lamp, the following key points should be considered:

1. **Normal Skin**: Normal, healthy skin typically appears as a bright white or yellow-green fluorescence.

2. **Pigmentation Disorders**:
   - **Vitiligo**: Depigmented areas appear bright white or blue-white due to the absence of melanin.
   - **Melasma**: Hyperpigmented areas may fluoresce yellow-brown.

3. **Fungal Infections**:
   - **Tinea Capitis**: Caused by *Microsporum* species, which fluoresce blue-green.
   - **Pityriasis Versicolor**: The rash emits a yellow or orange glow.

4. **Bacterial Infections**:
   - **Erythrasma**: A coral-pink fluorescence is observed in skin folds.
   - **Pseudomonas Infections**: Green fluorescence may indicate *Pseudomonas* infections.

5. **Acne**: Orange-red fluorescence is seen due to the presence of *Cutibacterium acnes* in hair follicles.

6. **Porphyria**: Red-pink fluorescence of the skin or teeth may suggest porphyria.

7. **Other Conditions**:
   - **Scabies**: Burrows created by scabies mites may appear as thin, dark lines under UV light.
   - **Head Lice**: Can be identified through fluorescence.

These fluorescence patterns help in the initial diagnosis of various skin conditions, though further tests may be required for confirmation. Proper interpretation requires training and clinical knowledge, and findings should always be evaluated by a qualified healthcare professional.

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