Derm - Atopic Conditions Flashcards
pattern of allergic contact dermatitis?
pattern of contact
itchy
red
dermatitis
pattern of irritant contact dermatitis?
pattern follows exposure
red
weeping
dry
fissures
what type of hypersensitivity is allergic contact dermatitis?
type IV cell mediated (Th1)
what causes irritant contact dermatitis?
due to direct contact with agents that irritate the skin
Ix for contact dermatitis?
patch test
Tx for allergic and irritant contact dermatitis?
allergic - avoid, emollient, steroid
irritant - same
what is type 1 hypersensitivity?
IgE mediated due to antigen exposure this causes crosslinking of IgE bound to mast cells
features of allergic reaction?
itch
hives
angioedema
wheeze
Ix for allergic reaction?
RAST skin prick challenge test
Tx for allergic reaction?
AVOID
antihistamines
steroids
mast cell stabilisers (sodium cromoglycate)
Tx for anaphylaxis?
300ug in adults
150ug in kids IM
risk factors for eczema?
asthma
hayfever
FHx
food allergy
allergic rhinitis
<5yrs
features of eczema?
flexors in adults
red itchy rash
small amount of scale
features of eczema, specific to kids?
face and extensors
cradle cap
napkin area spared
chronic skin changes that occur with eczema?
excoriations
lichenification
pigmentation
scarring
habit scratch
criteria for eczema diagnosis?
itch and 3 of…
visible flexural rash
Hx
Hx/FHx of atopy
dry skin
onset before 2yrs
Tx for eczema?
emollients
steroids
calcineurin inhibitors (tacrolimus)
antihistamines
phototherapy
DMARDs (AZA)
what antihistamines are used at day/night?
day = cetirizine
night = chlorphenamine
what is the steroid ladder?
hydrocortisone
eumovate
betnovate
dermovate
what bacteria commonly infects eczema?
staph aureus
what can commonly cause food allergy eczema?
milk
egg
what causes eczema herpeticum? Tx?
infection with HSV
oral/IV antivirals
features of eczema herpeticum?
fever
malaise
lymphadenopathy
describe this rash and give a diagnosis
monomorphic
erosive/punched out
blistered rash
comes on suddenly
itchy
eczema herpeticum
what is pompholyx eczema? features?
on the soles/palms
itchy, watery small blisters
