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Dermatology Quiz

Sudden onset of blistering lesions in a young boy

Date Posted: 10/05/2013
Fig 1a. Arm lesions
Figure 1a. Blistering lesions on the patient’s arm.

A 12-year-old boy presents with sudden onset of blistering lesions on his arms and legs, occurring a few days after he developed a typical cold sore on his upper lip.

What is the most likely diagnosis?

Asymptomatic annular lesions on the hand

Date Posted: 26/04/2013
Fig 1. Annular lesions
Figure 1. Asymptomatic annular lesions on the dorsum of the patient’s hand.

A 35-year-old man has two asymptomatic, annular lesions on the dorsum of his left hand, which have slowly expanded over the past three months.

What is the differential diagnosis of these lesions?

Lifelong irregular pale patches

Date Posted: 12/04/2013
Fig 1. Hypopigmented patches
Figure. Multiple irregular hypopigmented patches contrasting with surrounding erythema over the shoulder and back.

A man presents with a lifelong history of asymptomatic irregular pale patches outlined by a pink blush localised to his shoulder and back. These failed to react to dermographism. What is the differential diagnosis?

What is the differential diagnosis?

A blistering eruption in pregnancy

Date Posted: 05/04/2013
Fig 1. Symmetrical rash
Figure 1. A pregnant woman with a generalised symmetrical rash of blisters and serous crusts distributed in an annular configuration.

A pregnant woman presents with a generalised symmetrical rash of blisters and serous crusts that flared in the third trimester.

What is the most likely diagnosis and the differential diagnosis?

Reticulate pigmentation of axillae

Date Posted: 22/03/2013
Fig 1. Reticular pigmentation
Figure 1. Reticular pigmentation and papules on the axilla.

A woman presents with a 10-year history of asymptomatic mottled reticulate pigmentation localised to her axillae and groins. Her mother and sister were similarly affected.

What is the differential diagnosis?

Generalised itching with wrist lesions

Date Posted: 15/03/2013
Fig 1. Excoriated lesions
Figure 1. Excoriated lesions on the patient’s wrists.

A man presents with a six-week history of intense generalised pruritus sparing his face that is worse at night.

What is the diagnosis, the differential diagnosis and treatment?

Muscle weakness with knuckle erythema

Date Posted: 08/03/2013
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.

What is the likely diagnosis and differential diagnosis?

Pearly papules on the thighs

Date Posted: 01/03/2013
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.

What is the cause?

Pigmented rash localised to the groins

Date Posted: 22/02/2013
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.

What is the differential diagnosis?

Tufted hairs wrapped in asbestos-like scale

Date Posted: 15/02/2013
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.

What is differential diagnosis?

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