Understanding the Woods Lamp Test: How It Helps Diagnose Skin Conditions

What is a Woods Lamp Test?

A Woods Lamp Test uses ultraviolet (UV) light to examine the skin. Under this specialized light, certain skin conditions exhibit fluorescence, allowing dermatologists to diagnose concerns that may not be visible to the naked eye. This non-invasive test is quick, painless, and performed in a darkened room to enhance the visibility of fluorescence.

What Can a Woods Lamp Test Detect?

The Woods Lamp Test is useful for diagnosing a wide range of skin conditions, including:

1. Fungal Infections

Some fungal infections of the skin, scalp, or nails fluoresce under a Woods Lamp. For example:

• Tinea capitis (scalp ringworm) often appears as a bright greenish-blue fluorescence.

• Certain fungal species, such as Microsporum, glow under UV light, helping dermatologists determine the type of infection and appropriate treatment.

2. Bacterial Infections

Some bacterial infections produce characteristic fluorescence under a Woods Lamp:

• Pseudomonas infections glow green and are often found in wounds or moist environments.

• Erythrasma, a bacterial infection caused by Corynebacterium minutissimum, fluoresces a coral-red color.

3. Pigment Disorders

The Woods Lamp Test can help distinguish between different pigmentation conditions:

• Vitiligo (a condition causing loss of skin pigment) fluoresces bright white, making it easier to detect early patches.

• Melasma (dark patches on the skin) may show enhanced contrast, helping in treatment planning.

• Post-inflammatory hyperpigmentation and freckles may also be more clearly defined under UV light.

4. Other Skin Conditions

The Woods Lamp Test is also used to identify:

• Porphyria, a rare metabolic disorder that causes the skin and urine to glow under UV light.

• Head lice and nits, which may fluoresce white or bluish under the lamp.

• Sun damage and early signs of skin aging, which may appear as irregular pigmentation under UV light.

Why Choose MDCS Dermatology for Your Skin Care?

At MDCS Dermatology, our expert team, including Dr. Toral Vaidya, MD, MPH, uses advanced diagnostic techniques like the Woods Lamp Test to provide personalized treatment plans for our patients. Dr. Vaidya specializes in medical, surgical, and cosmetic dermatology, ensuring that each patient receives the highest standard of care. 

Book an Appointment Today

If you're experiencing unexplained skin discoloration, infections, or other dermatological concerns, a Woods Lamp Test may be the key to an accurate diagnosis. Schedule a consultation with our team today to receive expert care and customized treatment.

Book your appointment online now.

At MDCS Dermatology, we prioritize your skin health and are here to help you achieve your best skin yet!