Wood lamp examination is a diagnostic test in which the skin or hair is examined while exposed to the black light emitted by Wood lamp. A Wood’s light is a hand-held fluorescent lamp emitting long wave ultraviolet A. Pityriasis versicolor, which mainly affects the trunk, is due to certain species of malassezia. Allow the Wood lamp to warm up (about 1 minute), and give your eyes time to adapt to the dark. Tinea versicolor: Malassezia furfur yellowish-white or copper-orange.
A Wood’s lamp is a small handheld device that uses black light to illuminate areas of your skin. Washing the area before subjecting it for Wood’s lamp examination should be avoided since it may yield false negative results due to dilution of the pigment. The first use of Wood’s lamp was for the detection of tinea capitis based on the fact that some dermatophyte species produce characteristic fluorescence under UV light. Pityriasis versicolorMalassezia furfur emits a yellowish-white or copper-orange fluorescence. Tinea versicolor is a common, benign, superficial cutaneous fungal infection usually characterized by hypopigmented or hyperpigmented macules and patches on the chest and the back. However, in some cases, the lesions appear darker than the unaffected skin under the Wood light, but they do not fluoresce. (KOH) examination, which demonstrates the characteristic short, cigar-butt hyphae that are present in the diseased state.
Many people get tinea versicolor. It is one of the most common skin diseases in tropical and subtropical areas of the world. People who live in tropical areas may have tinea versicolor year-round. Tinea versicolor (now called pityriasis versicolor) is not caused by dermatophytes but rather by yeasts of the genus Malassezia. A Wood lamp examination may be helpful to distinguish tinea from erythrasma because the causative organism of erythrasma (Corynebacterium minutissimum) exhibits a coral red fluorescence. Diagnosis occasionally requires Wood’s lamp examination and fungal culture or histologic examination. (e.g., Malassezia furfur in tinea pityriasis versicolor) and Candida species.
Wood’s Lamp Examination: Purpose, Procedure & Results
(1,3,5) Examination under a microscope of skin scrapings can reveal the hyphae form of the yeast invading the stratum corneum. Utility of Wood’s Lamp Screening in Patients with Pityriasis Versicolor. 15 Since culture is often impractical, microscopic examination with KOH prep is commonly used to make the diagnosis of PV and to differentiate it from possible clinical mimickers. Amjo has been specializing in Black Lights or Woods Lamps for over a decade. Enrolled into the study were 44 subjects with tinea versicolor, provisionally confirmed by the detection of fungal hyphae in KOH wet mounts and Wood’s lamp examination. Tinea versicolor is caused by the organism Pityrosporum ovale. It occurs most often in young adults. Wood’s lamp examination revelas pale yellow-green fluorescence. Itraconazole versus ketoconazole in the treatment of tinea versicolor on ResearchGate, the professional network for scientists. We also demonstrated a lack of correlation between mycological cure and hypopigmentation at the end of treatment (2 weeks) and the usefulness of Wood’s lamp examination in detecting cure of tinea versicolor.