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Dermatology Quiz

Cobblestone plaques on the legs

Fig 1. Violaceous plaques
Figure 1. Violaceous plaques on the back of the calves.

A 32-year-old man presents with large, violaceous cobblestone plaques on his legs.

Progressive dusky facial erythema

Fig 1. Dusky erythema
Figure 1. Dusky erythema and swelling on the face, ear and neck.

An elderly man presents with progressive asymptomatic erythema and oedema on one side of his face over a 10-month period.

Annular scaling lesions on the limbs

Fig 1. Annular scarring
Figure 1. Annular scaling and crusted lesions on the extensor surface of the arm.

A 75-year-old woman presented with multiple scaling annular lesions on the sun-exposed skin of her limbs.

Pustules with scarring alopecia

Fig 1. Follicular cysts
Figure 1. Multiple small follicular cysts, papules, pustules and patchy scarring on the occipital area.

A 35-year-old man presents with multiple pustules and patchy alopecia on the occipital area of his scalp.

Asymptomatic annular lesions

Fig 1. Annular plaques
Figure 1. Annular plaques on the patient’s hand.

A 52-year-old woman presents with a series of asymptomatic annular lesions, with no scaling, on her limbs. The lesions had gradually increased in number and size over 12 months.

Widespread tense blisters

Fig 1. Tense blisters
Figure 1. Tense blisters on the patient’s lower limb.

A 52-year-old woman presents with widespread pruritic, tense blisters on her trunk and limbs. There are no mucous membrane lesions.

Progressive facial slate-grey pigmentation

Fig 1. Slate-grey pigmentation
Figure 1. Slate-grey pigmentation on the patient’s forehead.

A 68-year-old man presented with asymptomatic progressive pigmentation, confined to the sun-exposed sites of his face and hands. Details of his drug history plus a skin biopsy with UV light microscopy revealed the diagnosis.

Itchy coin-shaped lesions

Fig 1. Crusted lesions
Figure 1. Crusted coin-shaped lesions with small peripheral vesicles on the patient’s limb.

A 43-year-old man presented with pruritic, round, crusted lesions on his limbs. The size of the lesions varied, and there was a vesicular border.

Intermittently itchy reddish-brown spots

Fig 1. Red-brown lesions
Figure 1. Reddish-brown lesions on the patient’s back and upper limbs.

A 32-year-old man presents with persistent and numerous reddish-brown spots on his limbs and trunk. The lesions are stable, but occasionally there is an urticarial reaction when they are rubbed. A skin biopsy confirmed the diagnosis.

A pearly nodule on the back

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.

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