Woods Lamp Tinea Versicolor. Scrape off a bit of the skin. If the patient has tinea versicolor, the affected skin appears yellowish green in color when looked at with this lamp.
The dermatologist will hold the wood's lamp about 4 or 5 inches from the affected skin. Scrape off a bit of the skin. If the patient has tinea versicolor, the affected skin appears yellowish green in color when looked at with this lamp.