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ContactDermatitis
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<<forEachTiddler where 'tiddler.tags.contains(context.inTiddler.title)' sortBy tiddler.title ascending write '"*[["+tiddler.title+"]]\n"'>> <<tiddler AutoRefresh with: force>> ''irritant contact dermatitis'' common - non-allergic reaction due to weak acids or alkalis (e.g. detergents) Often seen on the hands. Erythema is typical, crusting and vesicles are rare ''allergic contact dermatitis'' type IV hypersensitivity reaction Uncommon - often seen on the head following hair dyes. acute weeping eczema which predominately affects the margins of the hairline rather than the hairy scalp itself. Topical treatment with a potent steroid is indicated Cement is a frequent cause of contact dermatitis. The alkaline nature of cement may cause an irritant contact dermatitis whilst the dichromates in cement also can cause an allergic contact dermatitis response to external agents itchy rash - redness scaly crusting, swelling , thickening, associated finger nail dystrophy allergic - type 4 reaction to allergen, maybe on palms, look for vesicles, may occur at distant sites where Tcells are. Irritant - non-immune reaction to irritant - more common, often on backs of hands (check occupation), limited to sites of exposure beware allergy to aqueous cream (common) need to use enough steroid remember palms are thick so seldom problem with skin thinning 1 fingertip unit should cover a whole hand Flare may be bacterial infection - needs Fluclox or E'mycin oral pred may help - 2/52 but may need systemics via 2ndary care (eg Ciclosporin or ?Alitretinoin) RAST - for type 1 reactions Skin prick test - for pollen, bee sting or food Patch test - for type 4 reactions
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