Itchy Eruptions Flashcards
What is urticaria
Local increase in permeability of capillaries and small venules, causing a raised itchy rash
Causes of urticaria
Foods, drugs, insect bites, contact, viral or parasitic infections, autoimmune, and hereditary
Presentations with urticaria
Angioedema, anaphylaxis
Management of urticaria
Antihistamines and corticosteroids for severe acute
Description of urticaria lesions
Pink wheels, can be round, annular or polycyclic
History of lichen planus
Family history 10%, may be drug induced
Common sites for lichen planus
Forearms, wrists, legs, oral mucosa
Description of lesion in lichen planus
Violaceous (iliac) flat topped papules or hyperpigmented papules in darker skin. Symmetrical distribution
Associated features with lichen planus
Nail changes, hair loss, lacy white streaks on oral mucosa and skin lesions (Wickham’s striae)
Management of lichen planus
Corticosteroids and antihistamines
History of patient with scabies
May have history of contact with symptomatic individuals, pruritis worse at night
Common sites of scabies
Sides of finers, finger webs, wrists, elbows, ankles, feet, nipples and genitals
Skin lesions in scabies
Linear burrows (can be tortuous) or rubbery nodules
Associated features of scabies
Secondary eczema and impetigo
Possible investigations into scabies
Skin scrape, look for mite under microscope
