Please enable JavaScript.
Coggle requires JavaScript to display documents.
Exogenous eczema (dermatitis) (2. Photosensitive eczema (Diagnosis…
Exogenous eczema
(dermatitis)
1. Contact
dermatitis
a) Allergic
Pathophysiology
Contact with an allergen e.g. nickel, chromate,
perfumes, nail varnish, latex, hair dye
Later in life due to repeat exposure
Epidemiology
Adults
Clinical presentation
Will present as red, itchy rash on area exposed e.g.
umbilicus (belt), hands (gloves), face (hair dye)
Diagnosis
Examination
Erythematous, dry, flaky skin on exposed area
History
PC/HPC: allergen, area affected
PMH: atopy/allergies
DH: meds, allergies
FH: dermatitis, other skin disorder
SH: occupation (exposure), smoking, alcohol
Investigations
Patch testing (Finn chambers): takes 1 week,
positive test = red rash on patch
Management
Conservative
Information and advice
Avoid allergen
Medical
Per atopic eczema
b) Irritant
Pathophysiology
Constant repeat exposure to an irritant
Happens to everyone if enough exposure
E.g. constantly washing hands
Clinical presentation
Itchy, dry, erythematous rash on exposed area
Diagnosis
History
PC/HPC: allergen, area affected
PMH: atopy/allergies
DH: meds, allergies
FH: dermatitis, other skin disorder
SH: occupation (exposure), smoking, alcohol
Examination
Erythematous, dry, flaky skin on exposed area
Management
Conservative
Information and advice
Avoid allergen
Medical
Per atopic eczema
2. Photosensitive
eczema
Epidemiology
Rare
Pathophysiology
Sun exposure causes irritant reaction in skin
Clinical presentation
Dry, itchy, erythematous rash on sun-exposed sites
Lichenification over time, may spread to non-sun exposed sites
Diagnosis
History
PC/HPC: rash, sun exposure
PMH: eczema, other skin conditions
DH: current meds, allergies
FH: eczema, atopy
SH: occupation (outside?), smoking, alcohol
Examination
Dry, erythematous rash on sun exposed sites
(face, neck, chest etc)
Management
Conservative
Information and advice
Avoid sun
Use sunscreen
Medical
Per atopic eczema
3. Phytophoto
eczema
Pathophysiology
Sap from some plants plus sun exposure
causes irritant reaction, certain plants
Clinical presentation
Erythematous, itchy, blisters on contact sites
Diagnosis
History
PC/HPC: rash, plant/sun exposure
PMH: eczema, other skin conditions
DH: current meds, allergies
FH: eczema, atopy
SH: occupation (outside?), smoking, alcohol
Examination
Dry, erythematous rash on sun/plant exposed sites
(face, neck, chest etc)
Management
Conservative
Information and advice
Avoid plant and sun
Use sunscreen
Medical
Per atopic eczema
