Eczema & dermatitis Flashcards
What is the major histological finding in eczema generally?
Spongiotic dermatitis
Which type of dermatitis shows extravasation of RBCs?
Stasis dermatitis
Which type of eczema is associated with the presence of eosinophils in histology?
Drug-related
Which type of eczema is due to repetitive trauma to the skin?
Contact eczema
Irritant eczema
Which type of eczema is due to type-1 hypersensitivity?
Drug-related
Which type of dermatitis is due type IV hypersensitivity reaction?
Contact allergic
Which type of dermatitis is due to physical trauma by hydrostatic pressure?
Stasis dermatitis
Explain the immunopatholgy behind contact allergic dermatitis
Langerhan cells present antigens to Th cells which activate T cell ativation
How do you test for contact allergic dermatitis?
Patch testing
What % of school-aged children are affected by atopic eczema?
25%
What are the 3 atopic condtions associated to eczema?
Allergic rhinitis
Asthma
Food allergy
What is the common infective organism in complicated eczema?
Staph.aureus
What is eczema herpeticum?
Infection by HSV over preexisting atopic eczema
Diagnosing eczema requires itching plus 3 or more of what?
Visible flexural rash History of flexural rash Personal history of atropy Generally dry skin Onset before age 2
Where is eczema normally on infants?
Not flexural surfaces
Cheeks and extensor surfaces
