DermNet

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

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

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

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