Chapter 32 :: Lichen Planus

Question 1

Dermoscopic features: absence of follicular opening, cicatricial white patches, peripilar casts and perifollicular scale, blue-gray dots, perifollicular erythema, and polytrichia (two or three hairs)

Answer 1

Lichen planopilaris, or follicular lichen planus

Question 2

Oral involvement occurs in approximately 60% to 70% of patients with lichen planus and may be the only manifestation in 20% to 30% of patients

Answer 2

Mucosal Lichen Planus

Question 3

most commonly affected with annular lesions of lichen planus

Answer 3

glans penis

Question 4

Nail involvement occurs in 10% to 15% of lichen planus patients.
Lichen planus limited to the nails is uncommon and, in many cases, is followed by the development of more typical cutaneous or mucosal lesions of lichen planus.
Nail involvement in children with lichen planus is rare and affects approximately 5%

Answer 4

Lichen Planus of the Nails

Question 5

most common findings of nail lichen planus

Answer 5

diffuse nail involvement with thinning, longitudinal ridging, and distal nail splitting (onychoschizia)

Question 6

Wickham striae are rare in this type

Answer 6

Drug-Induced Lichen Planus

Question 7

Most Likely Agents Inducing Lichen Planus and Lichenoid Drug Eruptions

Answer 7

β-Blockers

Question 8

Less Likely Agents Inducing Lichen Planus and Lichenoid Drug Eruptions

Answer 8

Tetracycline

Question 9

Contact Inducers of Lichen Planus

Answer 9

Color film developers

Question 10

Photo Inducers of Lichen Planus and Lichenoid Drug Eruption

Answer 10

Tetracycline

Question 11

oral lichen planus

Answer 11

risk of malignant transformation is low