woods lamp

As a detection method for clinical application of dermatology, it has a wide range of targets, such as: hemorrhoids, head lice, white peony, tinea versicolor, red peony, locust; some pigmented lesions such as chloasma, senile plaques, coffee spots Etc., there are also neurofibroma, skin tumors and so on.

The Wood lamp is called the "microscope" of the skin. When used for acne detection, it can accurately determine the degree of aggregation of Propionibacterium. Propionibacterium acnes also produces protoporphyrin, which produces brick-red fluorescence under the illumination of a wood lamp. This fluorescence can be detected, especially at the follicles of the nasolabial fold.

Wood Lamp is a new standard instrument for identifying vitiligo. It can accurately detect how much melanin is lost. Whether it is complete or incomplete vitiligo? It can also detect the lesions that have not been visible to the naked eye.

Detection principle

The WOOD lamp is a method for examining certain skin diseases by using 320 nm to 400 nm long-wave ultraviolet rays obtained through a filter plate containing nickel oxide, which will contribute to the diagnosis and treatment of these diseases. The long-wave ultraviolet light of 320-400 nm is obtained by the nickel-containing filter, and the affected area is irradiated with long-wave ultraviolet rays. If the melanin is reduced, the refractive index is strong and the light color is light; while the melanin is increased, the refractive index is weak and dark.

WOOD lamps contribute to the diagnosis of pigmented skin diseases, including vitiligo. Clinically, it is sometimes difficult for the naked eye to find light spots on normal skin, especially white skin. The WOOD lamp can easily detect vitiligo and distinguish it from other white spots. Especially when the hair follicle complex color begins to appear in the white spot, the initial color of the complex color is not obvious under natural light, but it can be confirmed by observation with a WOOD lamp.

The skin lesions of vitiligo under the WOOD lamp are pure white, and the contrast with the surrounding normal skin is clear and the boundary is clear. Depigmentation sputum, white pityriasis, nodular sclerosis, hypopigmentation after inflammation, hypopigmentation of leprosy, yellowish white or grayish white under WOOD lamp; tinea versicolor is brownish yellow or yellowish white; White skin lesions cannot be seen.

Method of operation

1. Connect the Wood Light power cord to the power supply. After pressing the switch for a few seconds, the light will be on;

2. To test through a magnifying glass in a dark room;

Detection method

1, the patient's discoloration sputum, white pityria, nodular sclerosis, post-inflammatory hypopigmentation, leprosy hypopigmentation spots, etc. Under the Wood light, yellow-white or gray-white spots, brownish yellow or yellow-white anemia Light white skin lesions cannot be seen.

2, when the friction or skin becomes red, observe that the white spot is the same redness, or the white spot is more obvious from the appearance, the latter suggests anemia.

3. Skin sensation examination, including examination of warm pain and touch. The patient's feeling is normal, and the leprosy leucorrhea often has shallow sensory damage, including the above-mentioned feelings of decline or even disappear.

4, the homomorphic reaction of vitiligo, in the normal pigmented skin of the patient's shoulder deltoid area, after the alcohol is routinely disinfected, the acne needle is scratched in a trapezoidal shape, the size is 1 cm, the scratch is examined after 1 month, the pigment is off Loss is positive, no pigmentation is negative, according to the experimental scratches can be judged as follows: the homomorphic reaction is positive, the lesions are mostly extended, the response to photochemotherapy is poor, and the application of glucocorticoids is better.

Superiority

1. It does not directly contact the inspection site during operation. It has the advantages of no pain, no infection, and is suitable for patients of all ages.

2, Wood Lamp called the "microscope" of the skin, can accurately detect how much melanin is lost, to distinguish whether it is complete or incomplete vitiligo, but also to screen out the lesions that have not been seen by the naked eye.

3, Wood Lamp makes the diagnosis of vitiligo become more simple, Wood Light check the diagnosis process does not take blood, no pain, the test results are fast and accurate.