Lichen planus

Question 1

what is it?

Answer 1

a skin disorder of unknown aetiology, most probably being immune-mediated.

Question 2

causes

Answer 2

gold
quinine
thiazides

Question 3

mx

Answer 3

topical steroids

oral - mouth wash bezydamine

extensive lichen planus - oral steroids or immunosuppression

Question 4

features

Answer 4

itchy, papular rash most common on the palms, soles, genitalia and flexor surfaces of arms

rash often polygonal in shape, with a ‘white-lines’ pattern on the surface (Wickham’s striae)

Koebner phenomenon may be seen (new skin lesions appearing at the site of trauma)

oral involvement in around 50% of patients: typically a white-lace pattern on the buccal mucosa

nails: thinning of nail plate, longitudinal ridging