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18/10/2026

A blistering eruption in a patient with Crohn disease — can you identify the diagnosis?
Clinical pearl: Linear IgA bullous dermatosis is an acquired autoimmune blistering disorder that may be associated with inflammatory bowel disease. The characteristic “string of pearls” sign describes blisters arranged in a ring-like pattern.
Diagnosis: Direct immunofluorescence typically demonstrates linear IgA deposition along the dermoepidermal junction.
Visit DermNet to explore the case, diagnostic clues, associated conditions and treatment options.
🔗 https://dermnetnz.org/cases/blistering-eruption-and-history-of-crohn-disease

15/10/2026

Cutaneous collagenous vasculopathy (CCV) is a rare, acquired microangiopathy characterised by multiple, progressive telangiectases, typically beginning on the lower limbs before spreading to the trunk and upper limbs.

Clinical pearl: CCV can resemble generalised essential telangiectasia. Histopathology helps distinguish the two, demonstrating dilated dermal vessels with thickened walls due to abnormal collagen deposition.

Visit DermNet for further information on clinical features, diagnosis, differential diagnoses, treatment and prognosis

🔗 https://dermnetnz.org/topics/cutaneous-collagenous-vasculopathy

13/10/2026

A farmer with a rash on the hand — what’s the diagnosis?
Hand rashes can have a wide range of causes, and occupational and environmental exposures are important clues when assessing skin lesions.
Clinical pearl: Always consider the patient's occupation, potential contact allergens and irritants, and relevant outdoor exposures when evaluating a hand rash
Visit DermNet to explore this case and learn more about the diagnosis
🔗 https://dermnetnz.org/cases/farmer-with-rash-on-left-hand

11/10/2026

Continuous glucose monitoring (CGM) devices have transformed diabetes management, but their adhesives and other components can cause allergic contact dermatitis in some users.
Key features: Pruritic, eczematous eruptions at the site of device application, which may correspond to the shape of the adhesive.
Diagnosis: Patch testing can help identify the causative allergen and guide avoidance strategies.
Visit DermNet for further information on clinical features, common allergens, diagnosis, management and prevention.
🔗 https://dermnetnz.org/topics/allergic-contact-dermatitis-to-glucose-monitoring-devices

28/09/2026

Despite its name, pyogenic granuloma has nothing to do with pus or infection and is a benign proliferation of capillary blood vessels, essentially a reactive haemangioma. It grows rapidly over days to weeks, often after minor trauma, and bleeds easily even with light contact. In pregnancy it's sometimes called a "pregnancy tumour," resolving after delivery in many cases but outside pregnancy, recurrence is common unless the underlying trigger (trauma, certain medications, hormonal factors) is addressed.

Read more here: https://dermnetnz.org/topics/pyogenic-granuloma

23/09/2026

Roseola has a distinctive and often confusing pattern: a high fever for 3–5 days, then, just as the fever breaks and the child seems to be improving, a pink, blanching rash appears on the trunk. It's caused by human herpesvirus 6B (and possibly HHV-7), and by age one, most children have already had it. Febrile seizures occur in 5–15% of cases due to the high temperatures, but they're brief and not dangerous. No specific treatment is needed as the rash itself is painless, non-itchy, and resolves on its own.

Read more here: https://dermnetnz.org/topics/roseola

20/09/2026

Onychophagia also known as nail biting is often dismissed as a harmless habit, but it can have real physical consequences beyond the nail itself: paronychia, fungal nail infection, and even teeth root resorption and malocclusion from chronic biting. It's classified as a form of onychotillomania and is associated with (though doesn't necessarily indicate) conditions such as OCD, ADHD, and anxiety disorders. Children can outgrow it, but persistent or severe cases benefit from behavioural treatment addressing the habit at its root.

Read more here: https://dermnetnz.org/topics/onychophagia

16/09/2026

A 33-year-old woman presented with a five-year history of pink, scaly papules and erythema around the nasolabial folds, chin, and upper lip, exacerbated by heat and stress.

What could this be?

09/09/2026

Blackheads dark colour comes from melanin, not trapped grime, which is why scrubbing harder doesn't clear them. They can either be closed or opened. Comedonal acne develops when skin cells lining the follicle proliferate and sebum production increases, blocking the duct with debris. Certain habits can make it worse, including oily cosmetics, smoking, and squeezing or picking at spots, which can rupture the follicle and worsen inflammation. Effective treatment relies on comedolytic agents like retinoids, benzoyl peroxide, or azelaic acid used consistently over weeks to months.

Read more here: https://dermnetnz.org/topics/comedonal-acne

06/09/2026

Erosive pustular dermatosis of the scalp — clinical features, associations, and management. Swipe to learn more or check out our full DermNet page on: dermnetnz.org/topics/erosive-pustular-dermatosis

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