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Heat urticaria - DermNet Heat urticaria must be differentiated from cholinergic urticaria (generalised heat urticaria) in that it is localised to the skin in contact with the heat stimulus and doesn’t involve the activation of sweat glands systemically Urticaria is a common symptom and can result from many precipitating or unknown causes, as described below
Exercise-induced vasculitis - DermNet Exercise-induced vasculitis mainly affects one or both lower legs and thighs, with single or multiple episodes of a rash with the following characteristics: Involvement of exposed skin and sparing of skin protected by socks or stockings Red patches, urticarial lesions (weals) and purpura (purple spots) Oedema (swelling) of the affected leg (s)
Cholinergic Urticaria: Causes, Treatment, and Images - DermNet Cholinergic urticaria (heat bumps) is characterised by short-lived hives that occur due to sweating Stimuli that can cause excessive sweating include exercise, spicy food ingestion, and emotional stress
Heat and cold - DermNet Miliaria Miliaria refers to sweat rash (prickly heat) due to obstructed sweat glands and perhaps localised hyperproliferation of specific commensal microorganisms such as strains of Staphylococcus epidermidis It presents with non- follicular superficial papules, vesicles or pustules mainly arising on the trunk
Intertrigo (Rash in body folds): Causes, Images, and More — DermNet Intertrigo describes a rash in the flexures, such as behind the ears, under the arms, and in the groin It is a sign of inflammation or infection Treatment depends on the underlying cause if identified
Tattoo-associated skin reactions - DermNet The reaction usually appears as an inflamed red rash or may sometimes be scaly and flaky (exfoliative dermatitis) Red tattoo pigments cause the most reactions, particularly those made from mercury sulfide (cinnabar) Hypersensitivity reactions to pigments used to make black, blue, purple and green tattoos are much less common
Erythema ab igne - DermNet Erythema ab igne (EAI) is a skin reaction caused by chronic exposure to infrared radiation in the form of heat It was once a common condition seen in the elderly who stood or sat closely to open fires or electric space heaters
Cutaneous adverse reactions to antibiotics - DermNet The rash may be more prominent on pressure-bearing points Systemic features may include fever and leukocytosis or lymphopenia (reduced lymphocytes) on blood testing Acute urticaria Acute urticaria is the second most common form of cutaneous drug reaction (see Drug-induced urticaria) Many antibiotics can cause urticaria
Differential diagnosis of very itchy skin - DermNet An acute or chronic itchy rash is most often due to dermatitis eczema Dermatitis can be primary, or secondary to scratching Stages include: Acute dermatitis: red, oozy, swollen skin Subacute dermatitis: red, dry skin Chronic dermatitis: skin coloured or dark, dry, thickened skin with prominent lines (lichenification)