The difference between pityriasis alba and vitiligo under Wood’s lamp is: pityriasis alba appears yellowish white or grayish white under Wood’s lamp, while vitiligo is porcelain white fluorescence under Wood’s lamp.
White furfura, also called simplex furfura, occurs at the age of 6-12 years old, and can also occur in young adults. The white spots are round or ovoid in the face, flush with the skin, with a few small scales on top, touching the rough, no conscious symptoms, the size of the patches varies, the early light red, can soon become light white, in the Wood’s lamp irradiation shows yellowish white or grayish white.
Vitiligo is the reduction of melanocytes, resulting in pigment loss, the skin at the white spots is smooth, no scales. Under the irradiation of Wood’s lamp presents bright white, pure white or porcelain white fluorescence. Due to the small amount of melanin loss in early vitiligo, it is a bluish-white fluorescent reaction under the Wood’s lamp. Vitiligo under the Wood’s lamp, you can also see white spots that can not be seen by the naked eye, such as invisible white spots.
When white patches appear on the skin, you should go to the hospital in time, give relevant examinations to confirm the diagnosis, and then give symptomatic treatment to improve the symptoms.