Woods Lamp Tinea Versicolor. Look at the skin with a special device called a wood's lamp. If the patient has tinea versicolor, the affected skin appears yellowish green in color when looked at with this lamp.

If the patient has tinea versicolor, the affected skin appears yellowish green in color when looked at with this lamp. Scrape off a bit of the skin. Look at the skin with a special device called a wood's lamp.