Dermatology Quiz

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.

Parasites harvested from the skin

Figure 1. Irregularly shaped excoriation on the forehead.

A 53-year-old woman presents with crawling sensations and an excoriation on her forehead. She brings a sample of the ‘parasites’ she says she has extracted from the lesion.

Persistent eroded lip in a young man

Fig 1. Eroded plaque
Figure 1. Eroded plaque on the lower lip.

A 29-year-old man presents with a persistent eroded and indurated plaque on his lower lip which has not responded to topical treatments.

A young man with a patchy beard

Fig 1. Beard hair loss
Figure 1. Patchy loss of beard hair with white stubble representing arrested hair growth.

A 24-year-old man presents with progressive loss of his beard hair in patches.

Nodular lesion with pustules on the index finger

Fig 1. Pustular nodule
Figure 1. Nodule with pustules on the index finger.

A 23-year-old tropical fish fancier presents with a nodular lesion on his finger which has not responded to antibiotics.

Multiple scrotal nodules with a chalky discharge

Fig 1. Scrotal nodules
Figure 1. Multiple nodules with chalky discharge on the scrotum.

A 45-year-old man presents with multiple nodules discharging a chalky substance on his scrotum.

Translucent, reddish-blue nodule on the lip

Fig 1. Translucent nodule
Figure 1. Reddish-blue translucent nodule on the lower lip.

A 28-year-old man presents with an asymptomatic reddish-blue translucent nodule on his lip.

Recurrent painful mouth ulcers

Fig 1. Mouth ulcers
Figure 1. Small painful ulcers on the mucosal surface of the lower lip.

A 36-year-old man presents with recurrent, painful ulcers on his lips and mobile oral mucosa.

Itchy, rippled skin pigmentation

Fig 1. Hyperpigmentation
Figure 1. Marked rippled hyperpigmentation over the upper back.

A 39-year-old man presented with a longstanding, widespread, itchy, brown pigmentation with a rippled pattern on his trunk and limbs.