Dermatology

Question 1

What is the most likely diagnosis of an asymptomatic, immunocompetent adult patient with a non-healing, isolated ulcer in the vermilion zone of the lower lip and a significant history of sun exposure?

Answer 1

squamous cell carcinoma

Question 2

Shallow, fibrin-coated ulcerations with underlying mononuclear infiltrates

Answer 2

aphthous ulcers

Question 3

recurrent, self-limiting ulcerations of indeterminate (possibly autoimmune) etiology

Answer 3

aphthae (canker sores)

Question 4

invasive clusters of spindle cells surrounded by palisaded basal cells

Answer 4

basal cell carcinoma

Question 5

What type of infection should you think of with small papular lesions with central umbilication that are either asymptomatic or pruritic and can occasionally be accompanied by surrounding dermatitis?

Answer 5

molluscum contagiosum

Question 6

What HIV patients are most susceptible to a widespread molluscum contagiosum infection?

Answer 6

Those with a CD4 count