DPM Dermatological Conditions of the Foot 2

Question 1

A patient presents with a well-demarcated, erythematous plaque with silvery scales on the heel. Nail pitting is also noted. What is the most likely diagnosis?

Accepted Answer

Psoriasis

Answer

Psoriasis on the foot typically presents as well-demarcated erythematous plaques with silvery scales, and nail pitting is a classic associated finding.

Question 2

Which layer of the epidermis is primarily affected in hyperkeratosis of the foot?

Accepted Answer

Stratum corneum

Answer

Hyperkeratosis involves thickening of the stratum corneum, the outermost layer of the epidermis.

Question 3

A diabetic patient develops a painless, punched-out ulcer over the first metatarsal head. What is the primary pathophysiological mechanism?

Accepted Answer

Peripheral neuropathy

Answer

Neuropathic ulcers in diabetics occur over pressure points due to loss of protective sensation from peripheral neuropathy.

Question 4

Pityriasis rubra pilaris affecting the foot characteristically produces which finding?

Accepted Answer

Islands of sparing within diffuse erythema

Answer

Pityriasis rubra pilaris classically shows islands of normal skin (sparing) within an otherwise diffuse erythroderma.

Question 5

A child presents with painless, flesh-colored papules on the sole with a central dell. What is the treatment of choice?

Accepted Answer

Cantharidin application

Answer

Molluscum contagiosum on the foot is treated with cantharidin, which induces blistering and destruction of the lesion.

(DPM) Doctor of Podiatric Medicine Practice Test

(DPM) Doctor of Podiatric Medicine Practice Test

DPM Dermatological Conditions of the Foot 2