13 - wood lamp examination of skin mcqs

Q: woodlamp examination will help in the diagnosis of all the diseases except ?

1. porphyria
2. rosacea
3. pityriasis versicolor ( tinea versicolor )
4. erythrasma

answer : b. rosacea .

--- to answer this question you need to know

Q: what is woodlamp examination ?

Answer : Wood's lamp was invented in 1903 by a Baltimore physicist, Robert W. Wood. It was first used in dermatology practice for the detection of fungal infection of hair by Margarot and Deveze in 1925.Wood's lamps are small, durable, inexpensive, safe and very easy to use. Although mainly used in the diagnosis of some infective and pigmentary dermatoses, they have recently been used as a diagnostic tool for certain skin cancers.

Q: how does the woodlamp help in diagnosing the skin disorders?

Answer : depending on the disease the skin is affected with this woodlamp shows different colours which helps us in diagnosing that particular condition .

Erythrasma ---- gives a ---- coral red colour

Pseudomonas ---- gives a ---- greenish colour

Porphyria cutanea tarda ---- gives a ---- pinkish red colour

Tuberous sclerosis ---- gives a ---- blue white colour and visibility of ash leaf macule ( verification needed )

Tinea capitis ---- gives a ---- light cream colour

Ptyriasis versicolor ---- gives a ---- golden yellow colour

Leprosy ---- gives a ---- blue white colour ( verification needed )

· Golden Yellow (Tinea Versicolor)

· Pale Green (Trichophyton Schoenleini)

· Bright Yellowgreen (Microsporum Audouini or M. Canis)

· Aquagreen To Blue (Pseudomonas Aeruginosa)

· Pink To Pinkorange (Porphyria Cutanea Tarda)

· Ash-Leaf-Shaped Spot (Tuberous Sclerosis)

· Bluewhite (Leprosy)

· Pale White (Hypopigmentation)

· Purplebrown (Hyperpigmentation)

· Bright White, Or Bluewhite (Depigmentation, Vitiligo)

· Bright White (Albinism)