Eczematous and Contact Dermatitis Flashcards
Describe the acute stage of eczematous dermatitis.
vesicles, blisters, or bullae
-erythema and pruritis
describe the subacute stage of eczematous dermatitis.
- erythema, scaling, fissuring
- parched or scalded appearance
describe the chronic stage of eczematous dermatitis.
lichenification, fissuring, and acentuated skin lines
what is asteatotic dermatitis?
“without sebum” dermatitis
=characterized by dry scaling and fine superficial cracking due to decreased skin surface lipids (dry winter weather, harsh soaps, frequent bathing, age)
what is atopic dermatitis?
(aka allergic eczema)
chronically relapsing skin eczema that presents at an early age associated with allergic rhinitis and asthma
describe the presentation of atopic dermatitis.
erythematous papulovesicular eruption that evolves into dry, scaly dermatitis with accentuated skin lines (and becomes lichenified plaques over time)
diagnose this; no primary lesion; there is a recurrent extremely pruritic rash and presents with personal history of seasonal allergies and eczema.
atopic dermatitis
describe how the distribution of atopic dermatitis varies with age.
0-2 y/o: face, wrists, EXTENSOR surfaces; papulovesicular lesions
2-12y/o: FLEXOR surfaces; maculopapular lesions
adolescents-adults: flexor surfaces, wrists/hands/knees/feet; lichenification
which dermatitis is brought on by stress and hyperhidrosis and is usually worse in the summer?
dyshdrotic eczema
which dermatitis looks like tinea pedis (but isn’t because it frequently appears in medial heel region and sole as opposed to interdigitally)?
dyshidrotic eczema
which contact dermatitis is NOT immunologically mediated?
primary irritant contact derm
which contact dermatitis does not require a primary sensitization?
primary irritant contact derm
which contact dermatitis comprises 80% of contact derm?
primary irritant contact derm
which contact dermatitis has a delayed reaction?
allergic contact derm
which contact derm has an irritant rxn that can occur right away after contact?
primary irritant contact derm
which type of hypersensitivity reaction does allergic contact derm follow?
type 4 hypersensitivity rxn
which contact derm is immunologically mediated?
allergic contact derm
delayed T-cell mediated immune response
describe the 3 phases of allergic contact derm.
- irritant phase- localized erythema
- allergic phase- inflammation and small pruritic vesicles and papules
- vesicular phase- bullae formation
which contact dermatitis looks like a burn with large blisters?
irritant contact derm
which contact derm appaers with erythema, vesiculation and edema?
allergic contact derm
which contact derm has “stinging t hen itching”
irritant
which contact derm has “itching then pain”
allergic contact
which dermatitis has borders that are confined to site of exposure?
irritant
which dermatitis has borders that may spread beyond the site of exposure?
allergic contact
why does a phototoxic reaction to plants occur in phytophotodermatitis?
due to light sensitive compound called Furocoumarins (psoralens) in plants
