18 results
Hypersensitivity: Summary
Type I Hypersensitivity:
 • Immunological Mediator: lgE
 • Immunological Target: Allergen Molecules
 • Ex: Antibiotic
Immunological Target: Allergen ... fever, Urticaria, Allergic ... • Ex: Systemic Lupus ... Syndrome, Contact Dermatitis ... Classification #Diagnosis
Eczematous Skin Rash - Differential Diagnosis Algorithm
Eczematous - Pruritic/Scaly/Erythematous lesions. Usually poorly demarcated
 • Atopic Dermatitis
- Differential Diagnosis ... ) • Nummular Dermatits ... anyone - Allergic ... #Eczematous #SkinRash ... #Differential #Diagnosis
Hair Loss (Alopecia) - General (Diffuse and Focal) Differential Diagnosis Algorithm

DIFFUSE
Scarring - Irreversible-biopsy required
 • Lupus
) Differential Diagnosis ... Infectious • Tinea ... • Discoid lupus ... Shafts • Tinea ... #Differential #Diagnosis
Allopecia - Differential Diagnosis Framework for Hair Loss

Localized / Focal Hair Loss Pattern:
 • Scarring Alopecia:
- Differential Diagnosis ... Localized / Focal ... Folliculitis decalvans, Tinea ... Disease: Discoid lupus ... Broken Hair Shafts: Tinea
Vesiculobullous Skin Rash - Differential Diagnosis Algorithm
Vesicles Fragile/EasiIy Ruptured - Intraepidermal blisters, possibly crusts/erosions
 - Inflammatory
- Differential Diagnosis ... • Contact dermatitis ... Bullous systemic lupus ... Vesiculobullous #SkinRash ... #Differential #Diagnosis
Hypersensitivity Types and Their Mechanisms
Type I - lgE - Soluble antigen
 - Allergen-specific lgE antibodies bind
When the specific allergen ... - Local and systemic ... , and systemic lupus ... - Contact dermatitis ... #Diagnosis #Reactions
Summary table of types of hypersensitivity reactions. 
Type 1
 - Mediators: lgE
 - Antigen Form: Soluble
chain causing local ... glomerulonephritis, Systemic lupus ... Examples: Contact dermatitis ... reactions #types #allergy ... classification #comparison
Moccasin-variety Tinea Pedis 
70 M chronic scaly feet. Over the years: rash has itched only occasionally;
Moccasin-variety Tinea ... Diagnosis? ... Moccasin type tinea ... dyshidrotic, atopic, or allergic ... eczematous dermatitis
Papulosquamous Skin Rash - Differential Diagnosis Algorithm
Erythrematous or violaceous papules & plaques with overlying scale
 •
- Differential Diagnosis ... Herald's atch • Tinea ... soles • Discoid Lupus ... Papulosquamous #SkinRash ... #Differential #Diagnosis
Focal / Localized Hair Loss (Alopecia) - Differential Diagnosis Algorithm

Scarring - Irreversible-biopsy required
 - Infectious
Focal / Localized ... - Differential Diagnosis ... Infectious • Tinea ... • Discoid lupus ... Shafts • Tinea