Dr.Sanaabout 7 years ago

Erythrasma----Wood lamp examination

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. Black light is invisible to the naked eye because it is in the ultraviolet spectrum, with wavelength just shorter than the colour violet. The lamp glows violet in a dark environment, because it also emits some light in the violet part of the electromagnetic spectrum. Erythrasma is an infection of the skin with Corynebacterium minutissimum ...itchy eruptions which are well defined and reddish brown in color and appear as coral pink fluorescence with Wood's light examination