Key Points Irritant contact dermatitis (ICD) – Accounts for 80% of all causes of contact dermatitis – Secondary to a local toxic effect caused by a topical substance or physical insult Allergic contact dermatitis (ACD) – Accounts for 20% of…
The major forms of dermatitis include atopic (see Ch. 10 ), contact (see Ch. 12 ), seborrheic, asteatotic (xerotic), stasis, and nummular. Dermatitis of special sites – i.e. hands, feet, lips, eyelids, diaper area, and major body folds – is…
Introduction Common inflammatory skin disease that affects 10–25% of children and 2–10% of adults in most high-income and some low-income countries. Eczematous dermatitis characterized by intense pruritus and a chronic or chronically relapsing course. Sequelae often include sleep disturbances, psychological…
Lichen Planus Idiopathic disorder that can affect the skin, hair, nails, and/or mucosae (oral, vulvovaginal) and most commonly affects adults. May represent a T-cell-mediated autoreactive disorder against keratinocytes whose self-antigens have been altered by trauma or infection (e.g. HCV). Flat-topped…
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Parapsoriasis Chronic, usually asymptomatic patches or thin plaques with fine scale whose color varies from pink to red-brown; may have associated epidermal atrophy and occasionally poikiloderma (large plaque parapsoriasis). Two major forms of parapsoriasis are small plaque (lesions usually <5…
Key Points Affects up to 2% of the population. Chronic disorder in those with a polygenic predisposition combined with triggering factors such as infections (especially streptococcal infection, but also HIV infection) or medications (e.g. interferon, β-blockers, lithium, or oral CS…
Introduction Psychodermatology refers to any aspect of dermatology in which psychological factors play a significant role. Psychodermatologic disorders can be classified in two ways: (1) by the specific psychodermatologic condition or (2) by the underlying psychopathology ( Fig. 5.1 ).…
Definitions Pruritus: an unpleasant sensation of the skin that elicits a desire to scratch. Dysesthesia: an unpleasant, abnormal sensation that can be either spontaneous or evoked; abnormal, unpleasant sensations may include pain, pruritus (“neuropathic itch”), tingling, burning, “pins and needles”.…
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