Andrews Chapter 12: Lichen Planus and Related Conditions

Question 1

lichen planus follicularis tumidus

Answer 1

retroauricular area area and cheeks; tumid red-violet plaques covered with numerous small, white yellow cysts and comedones

Question 2

hyperpigmentation ddx

Answer 2

lichen planus pigmentosus/actinicus vs EDP/ashy dermatosis vs idiopathic eruptive macular pigmentation (in kids) vs PIH

Question 3

guttate scaly lesions ddx

Answer 3

PR, syphilis, LP, guttate psoriasis, PLEVA

Question 4

atropic guttate lesion ddx

Answer 4

guttate morphes, guttate LS

Question 5

disease course of lichen nitidus and lichen planus

Answer 5

reassure - self resolves without scarring

Question 6

lichen striatus vs linear lichen planus

Answer 6

dense lymphoid infiltrate around eccrine gland/duct

Question 7

lichen sclerosus vs lichen planus of anogenital area

Answer 7

lichen sclerosus does NOT affect cervical/vaginal mucosa, unlike LP