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Itchy skin disease

Dermatitis key points test

Acute dermatitis is characterised by: #! Erythema # Lichenification #! Pruritus #! Vesicles Explanation: Acute dermatitis is characterised by erythema, vesiculation and oozing. Topical therapies for dermatitis include: #! Emollients #! Corticosteroids # Antihistamines #! Calcineurin inhibitor Explanation: Treatment of dermatitis should always include emollients. Corticosteroids in various potencies are used for flare-ups. New immunomodulating creams such as pimecrolimus are proving useful to prevent flares. Oral antihistamines can reduce itch but rarely modify the skin disease. Atopic dermatitis is characterised by: # Onset between ages of 5 and 15 #! Association with asthma and allergic rhinitis # Oily skin # Round plaques Explanation: Atopic dermatitis is characterised by onset in childhood, association with asthma and allergic rhinitis, dry skin and intermittent flare-ups. Nummular dermatitis is characterised by: # Onset between ages of 5 and 15 # Association with asthma and allergic rhinitis # Oily skin #! Round plaques Explanation: Nummular (discoid) dermatitis is characterised by clusters of round or oval plaques. Common causes of irritant contact dermatitis include: #! Friction #! Detergents # Nickel #! Cosmetics Explanation: Irritant contact dermatitis occurs at the site of cutaneous injury. Irritants include friction, water, detergents, solvents and many other substances. Common causes of allergic contact dermatitis include: # Friction # Detergents #! Nickel #! Cosmetics Explanation: The most common contact allergens are nickel and fragrances. Allergic contact dermatitis is due to: # IgE mediated immediate hypersensitivity # Autoimmune sensitivity # Immune complex deposition #! Delayed hypersensitivity Explanation: Allergic contact dermatitis is due to delayed hypersensitivity. Allergic contact dermatitis is confirmed by: # Prick tests #! Patch tests # Histology # Direct immunofluorescence Explanation: Allergic contact dermatitis is confirmed by epicutaneous patch tests. Match the diagnosis with the description: Mix and match: Lichen simplex: Localised lichenified dermatitis Seborrhoeic dermatitis: Scaly rash on scalp and face Pompholyx: Palmoplantar vesicles Venous eczema: Hyperpigmentation and induration of lower legs Asteatotic dermatitis: Dry fissured plaques on lower legs Autosensitisation: Generalised dermatitis

Choose the best diagnosis for each image:

* Atopic dermatitis * Nummular dermatitis * Irritant contact dermatitis * Allergic contact dermatitis * Seborrhoeic dermatitis *! Venous eczema * Autosensitisation dermatitis * Eczema herpeticum * Atopic dermatitis * Nummular dermatitis * Irritant contact dermatitis * Allergic contact dermatitis * Seborrhoeic dermatitis * Venous eczema * Autosensitisation dermatitis *! Eczema herpeticum * Atopic dermatitis * Nummular dermatitis * Irritant contact dermatitis * Allergic contact dermatitis * Seborrhoeic dermatitis * Venous eczema *! Autosensitisation dermatitis * Eczema herpeticum * Atopic dermatitis * Nummular dermatitis * Irritant contact dermatitis * Allergic contact dermatitis *! Seborrhoeic dermatitis * Venous eczema * Autosensitisation dermatitis * Eczema herpeticum * Atopic dermatitis * Nummular dermatitis * Irritant contact dermatitis *! Allergic contact dermatitis * Seborrhoeic dermatitis * Venous eczema * Autosensitisation dermatitis * Eczema herpeticum * Atopic dermatitis * Nummular dermatitis *! Irritant contact dermatitis * Allergic contact dermatitis * Seborrhoeic dermatitis * Venous eczema * Autosensitisation dermatitis * Eczema herpeticum *! Atopic dermatitis * Nummular dermatitis * Irritant contact dermatitis * Allergic contact dermatitis * Seborrhoeic dermatitis * Venous eczema * Autosensitisation dermatitis * Eczema herpeticum *! Atopic dermatitis * Nummular dermatitis * Irritant contact dermatitis * Allergic contact dermatitis * Seborrhoeic dermatitis * Venous eczema * Autosensitisation dermatitis * Eczema herpeticum * Atopic dermatitis *! Nummular dermatitis * Irritant contact dermatitis * Allergic contact dermatitis * Seborrhoeic dermatitis * Venous eczema * Autosensitisation dermatitis * Eczema herpeticum