Dermatology Quiz

Muscle weakness with knuckle erythema

Fig 1. Erythema
Figure 1. Dorsum of the patient’s hand showing erythema over the knuckles and interphalangeal joints.

A boy develops facial rash, periungual erythema and pruritic erythematous patches on his knuckles and interphalangeal joints. General malaise and proximal muscle weakness was also present.

Pearly papules on the thighs

Fig 1. Pearly papules
Figure 1. Pearly papular lesions and an inflamed lesion on the patient’s left thigh.

A boy has developed pearly, umbilicated, firm papules on his thighs.

Pigmented rash localised to the groins

Fig 1. Pigmented rash
Figure 1. Pigmented rash involving both groins and perineum.

A man presents with an irritable, pigmented rash confined to his groins and perineal area.

Tufted hairs wrapped in asbestos-like scale

Fig 1. Hair scale
Figure 1. Thick asbestos-like scale wrapped around tufts of scalp hair.

A woman presents with adherent asbestos-like scale bound around tufts of hair within her scalp.

Acral blisters with arthritis

Fig 1. Acral blisters
Figure 1. Acral blisters and erosions on the patient’s hand.

Over two months, a woman developed nonpruritic blisters and fragile skin on the dorsal surfaces of her hands. These developed after commencing naproxen for arthritis.

Tense blisters with IgA deposits

Fig 1. Blisters
Figure 1. Large blisters on the palm.

A woman, post cardiac surgery, develops large blisters from urticarial lesions on her palms and soles after receiving vancomycin and ciprofloxacin for a postsurgical wound infection.

Itchy blisters on exposed skin

Fig 1. Blisters
Figure 1. Blisters at different stages on the patient’s lower leg.

A woman presents with a two-week history of pruritic blisters, at various stages of evolution, over her limbs.

An inflamed solar lentigo

Fig 1. Inflamed solar lentigo
Figure 1. Sharply demarcated lesion with a cobblestone surface. Note surrounding sun damage, freckles and solar lentigines.

A 65-year-old man presents with a recently inflamed, dusky red-brown lesion on his chest that displayed multiple freckles and solar lentigines.

A persistent red papule on the thigh

Fig 1. Red papule
Figure 1. Symmetrical moist red papule with a collarette of scale on the thigh.

A 54-year-old man presented with a longstanding, symmetrical, small, red papule on his thigh that had not grown and was asymptomatic.

Split, atrophic nails with a pterygium

Fig 1. Atrophic nail plates
Figure 1. Thumbnails demonstrating atrophic nail plates with longstanding ridging, distal clefting and lamellar peeling. The left thumbnail also has a triangular scar extending from the proximal nail fold (pterygium).

A 58-year-old woman presents with atrophic and split fingernails, partially covered by a web of tissue.