Dermatitis Flashcards
Acute manifestations of Dermatitis
erythema, vesiculation, weeping, edema
Chronic manifestations of Dermatitis
thickening, lichenification, scaling
Histologic features of Dermatitis
Acanthosis
Spongiosis
Exocytosis
Subcortical pustule
thickening of the rete ridges
acanthosis
edema and serous exudates between the epidermis cells
spongiosis
presence of infiltrates in the epidermis and the dermis
exocytosis
presence of neutrophils and bacteria on the epidermis
subcortical pustule
Sign of scratching and the end stage of eczema or dermatitis
Lichen Simplex Chronicus
Classification of dermatitis
Exogenous
Endogenous
Unclassified
Dermatitis arising from direct skin exposure to a substance
Contact dermatitis
acids alkalis metalic elements salt essential oils
Strong irritants
detergent
organic solvent
water
weak/mild irritants
allergic contact dermatitis is elicited by what type of hypersensitivity
type 4
occurs when a particular substance elicits a type 4 hypersensitivity reaction
allergic contact dermatitis
two phases of allergic contact dermatitis
sensitization phase ( first contact with allergen ) elicitation phase ( subsequent contact)
Lesion is sharp, strictly confined to the site of exposure but spreading to the periphery. Due to exposure to a substance illicit type 4 hypersensitivity
Allergic contact dermatitis
most common cause of topical medication dermatitis
neomycin
cause of metal dermatitis
nickel and cobalt
cause of footwear dermatitis
rubber
Purpuric ACD
Lichenoid ACD
Lymphomatoid ACD
ECtopic ACD/ airborne ACD
Non-eczematous variants
Types of ectopic / airborne ACD
Autotransfer
Heterotransfer
eruption caused by sensitization due to sun activated irritant/ allergen
photocontact dermatitis
components of photocontact dermatitis
chemical + sun exposure
main symptom of contact dermatitis
pruritus