Dermatology Quiz

A pearly nodule on the back

Date Posted: 08/07/2011
Fig 1. Pearly nodule
Figure 1. A pearly nodule on the patient’s upper back.

A 38-year-old man presents with a smooth, shiny and well demarcated pearly nodule on his upper back. The nodule is asymptomatic and of unknown duration.

What is this lesion?

Recurrent dusky skin lesions

Date Posted: 01/07/2011
Fig 1. Erythematous lesion
Figure 1. An erythematous lesion with dusky centre located on the patient’s trunk.

A 35-year-old woman presents with erythematous lesions on her upper limbs and trunk shortly after taking antibiotics for a urinary tract infection.

What is this condition and how can it be treated?

Progressive pigmented purpura

Date Posted: 24/06/2011
Fig 1. Pigmented patches
Figure 1. Irregular pigmented patches with purpura on the pretibial areas.

A 42-year-old woman presents with progressive yellow–brown pigmentation associated with nonpalpable purpura over her shins.

What is this skin disorder?

An acute pustulovesicular eruption

Date Posted: 17/06/2011
Fig 1. Pustular lesions
Figure 1. Arciform pustulovesicular lesions on the upper arm.

A middle-aged woman presents with a recent history of tender annular and bow-shaped pustular lesions on her face, neck, and upper limbs.

What is this skin disorder and how should it be treated?

Scarring alopecia with tufted folliculitis

Date Posted: 10/06/2011
Fig 1. Scarring alopecia
Figure 1. An irregular area of scarring alopecia on the vertex of the scalp.

A 34-year-old woman presents with an 18-month history of progressive hair loss, associated with tenderness, on her scalp. Tufted follicles and scarring alopecia were the key to diagnosis.

What is the diagnosis and how would you treat it?

Skin necrosis with vascular calcification

Date Posted: 03/06/2011
Fig 1. Skin necrosis
Figure 1. Irregular areas of skin necrosis with dark eschar over the lower leg.

A 59-year-old woman with chronic renal failure presents with a recent history of multiple progressive, painful ulcers over the lower limbs.

What is the correct diagnosis and how would you treat it?

Itchy papules on the trunk and limbs

Date Posted: 27/05/2011
Fig 1. Itchy papules
Figure 1. Multiple pale pink papules at different stages. Note the hyperpigmented areolae, increased skin markings (lichenification), and focal dark crust.

A 47-year-old woman developed persistent itchy papules on the trunk and limbs over a two-year period.

What are these lesions and how can they be treated?

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