- Published on
Emergency And Acute Medicine - Eczema / Atopic Dermatitis
Core Overview
Atopic dermatitis is the most frequent cause of eczema, and the terms are commonly used interchangeably. It is strongly associated with other atopic conditions, including asthma and allergic rhinitis. The term eczema refers to spongiosis, a process in which microscopic vesicles form within the epidermis and subsequently rupture, producing erythema, edema, crusting, and oozing. Intense pruritus is a hallmark feature. Repeated rubbing and scratching lead to skin breakdown with weeping and crust formation, while chronic disease results in epidermal hyperplasia and hyperkeratosis. Approximately 90% of patients are colonized with Staphylococcus aureus, predisposing them to recurrent secondary infections.
Predisposing Factors
Genetic susceptibility plays a major role, particularly a family history of atopic disease such as asthma or allergic rhinitis. Mutations in the filaggrin protein, a key component of the epidermal barrier, are strongly associated with disease development.
Underlying Mechanism
Atopic dermatitis arises from impaired epidermal barrier function, allowing allergens and irritants to penetrate the skin and trigger immune-mediated inflammation.
Clinical Features
Patients typically report a pruritic rash and a personal or family history of atopy. Diagnostic criteria emphasize pruritus plus additional features such as flexural involvement, history of asthma or allergic rhinitis, chronically dry skin, onset before two years of age, and visible flexural dermatitis. Other commonly reported findings include recurrent skin infections, itching with sweating, intolerance to wool or lipid solvents, and symptom exacerbation during periods of stress.
Physical Examination Findings
Dermatitis is commonly located in areas of friction or movement, including flexural surfaces, hands, and feet. Skin findings reflect barrier disruption with dryness, weeping, oozing, and crusting, along with inflammatory changes such as maculopapular erythema and edema. Chronic scratching leads to excoriations, fissuring, lichenification, and hyperkeratosis. Additional characteristic signs may include ichthyosis, palmar hyperlinearity, keratosis pilaris, hand or foot dermatitis, nipple involvement, cheilitis, Dennie–Morgan infraorbital folds, periocular darkening, facial pallor or erythema, pityriasis alba, perifollicular accentuation, and white dermographism or delayed blanching.
Special Pediatric Considerations
Most cases begin early in life, with approximately 70% presenting within the first five years. Only a small proportion begin in adulthood. A significant percentage of affected children later develop asthma or allergic rhinitis. In infants, lesions classically involve the face, scalp, and extensor surfaces.
Essential Evaluation
Diagnosis is primarily clinical and based on history and physical examination.
Diagnostic Testing Considerations
Laboratory studies are generally unnecessary in the emergency setting. Although IgE levels are often elevated, routine testing is not required. Specialized testing such as allergen-specific IgE assays or patch testing is typically reserved for outpatient evaluation, particularly when allergic contact dermatitis is suspected.
Conditions To Differentiate From
Important alternative diagnoses include seborrheic dermatitis, lichen simplex chronicus, allergic or irritant contact dermatitis, psoriasis, dyshidrotic eczema, ichthyosis, and scabies.
Emergency Department Management
Mild disease or involvement of the head and neck is treated with low-potency topical corticosteroids such as hydrocortisone and regular emollient application. Moderate to severe disease affecting the trunk or extremities may require mid- to high-potency topical corticosteroids. Severe head and neck involvement is best managed with topical calcineurin inhibitors such as tacrolimus or pimecrolimus. First-generation antihistamines may be used to reduce pruritus, though their efficacy is limited. Supportive measures include avoiding excessive bathing, using tepid water and mild soaps, and applying emollients frequently. Suspected bacterial superinfection should prompt treatment with appropriate antibiotics, with consideration for methicillin-resistant Staphylococcus aureus.
Pharmacologic Options
Emollients such as petrolatum-based ointments are foundational therapy. Topical corticosteroids are selected based on disease severity and location. Calcineurin inhibitors are useful alternatives for sensitive areas such as the face. Antihistamines may aid symptom control. Antibiotics are indicated when secondary infection is present.
Disposition And Referral Planning
Patients with refractory or severe disease should be referred for dermatology follow-up.
Ongoing Care Guidance
Patients should be counseled regarding potential adverse effects of therapy. Prolonged use of high-potency topical corticosteroids can lead to skin atrophy. Calcineurin inhibitors may cause transient stinging during initial use, and long-term safety considerations should be discussed.
Key Clinical Insights And Common Errors
Always consider secondary bacterial infection, as colonization with S. aureus is common. Use topical calcineurin inhibitors preferentially for moderate to severe disease of the face and neck. Lotions may worsen dryness due to low lipid content; thick creams or ointments are preferred. Avoid using medium- or high-potency topical corticosteroids on the face or eyelids to prevent complications.
Core Overview
Atopic dermatitis is the most frequent cause of eczema, and the terms are commonly used interchangeably. It is strongly associated with other atopic conditions, including asthma and allergic rhinitis. The term eczema refers to spongiosis, a process in which microscopic vesicles form within the epidermis and subsequently rupture, producing erythema, edema, crusting, and oozing. Intense pruritus is a hallmark feature. Repeated rubbing and scratching lead to skin breakdown with weeping and crust formation, while chronic disease results in epidermal hyperplasia and hyperkeratosis. Approximately 90% of patients are colonized with Staphylococcus aureus, predisposing them to recurrent secondary infections.
Predisposing Factors
Genetic susceptibility plays a major role, particularly a family history of atopic disease such as asthma or allergic rhinitis. Mutations in the filaggrin protein, a key component of the epidermal barrier, are strongly associated with disease development.
Underlying Mechanism
Atopic dermatitis arises from impaired epidermal barrier function, allowing allergens and irritants to penetrate the skin and trigger immune-mediated inflammation.
Clinical Features
Patients typically report a pruritic rash and a personal or family history of atopy. Diagnostic criteria emphasize pruritus plus additional features such as flexural involvement, history of asthma or allergic rhinitis, chronically dry skin, onset before two years of age, and visible flexural dermatitis. Other commonly reported findings include recurrent skin infections, itching with sweating, intolerance to wool or lipid solvents, and symptom exacerbation during periods of stress.
Physical Examination Findings
Dermatitis is commonly located in areas of friction or movement, including flexural surfaces, hands, and feet. Skin findings reflect barrier disruption with dryness, weeping, oozing, and crusting, along with inflammatory changes such as maculopapular erythema and edema. Chronic scratching leads to excoriations, fissuring, lichenification, and hyperkeratosis. Additional characteristic signs may include ichthyosis, palmar hyperlinearity, keratosis pilaris, hand or foot dermatitis, nipple involvement, cheilitis, Dennie–Morgan infraorbital folds, periocular darkening, facial pallor or erythema, pityriasis alba, perifollicular accentuation, and white dermographism or delayed blanching.
Special Pediatric Considerations
Most cases begin early in life, with approximately 70% presenting within the first five years. Only a small proportion begin in adulthood. A significant percentage of affected children later develop asthma or allergic rhinitis. In infants, lesions classically involve the face, scalp, and extensor surfaces.
Essential Evaluation
Diagnosis is primarily clinical and based on history and physical examination.
Diagnostic Testing Considerations
Laboratory studies are generally unnecessary in the emergency setting. Although IgE levels are often elevated, routine testing is not required. Specialized testing such as allergen-specific IgE assays or patch testing is typically reserved for outpatient evaluation, particularly when allergic contact dermatitis is suspected.
Conditions To Differentiate From
Important alternative diagnoses include seborrheic dermatitis, lichen simplex chronicus, allergic or irritant contact dermatitis, psoriasis, dyshidrotic eczema, ichthyosis, and scabies.
Emergency Department Management
Mild disease or involvement of the head and neck is treated with low-potency topical corticosteroids such as hydrocortisone and regular emollient application. Moderate to severe disease affecting the trunk or extremities may require mid- to high-potency topical corticosteroids. Severe head and neck involvement is best managed with topical calcineurin inhibitors such as tacrolimus or pimecrolimus. First-generation antihistamines may be used to reduce pruritus, though their efficacy is limited. Supportive measures include avoiding excessive bathing, using tepid water and mild soaps, and applying emollients frequently. Suspected bacterial superinfection should prompt treatment with appropriate antibiotics, with consideration for methicillin-resistant Staphylococcus aureus.
Pharmacologic Options
Emollients such as petrolatum-based ointments are foundational therapy. Topical corticosteroids are selected based on disease severity and location. Calcineurin inhibitors are useful alternatives for sensitive areas such as the face. Antihistamines may aid symptom control. Antibiotics are indicated when secondary infection is present.
Disposition And Referral Planning
Patients with refractory or severe disease should be referred for dermatology follow-up.
Ongoing Care Guidance
Patients should be counseled regarding potential adverse effects of therapy. Prolonged use of high-potency topical corticosteroids can lead to skin atrophy. Calcineurin inhibitors may cause transient stinging during initial use, and long-term safety considerations should be discussed.
Key Clinical Insights And Common Errors
Always consider secondary bacterial infection, as colonization with S. aureus is common. Use topical calcineurin inhibitors preferentially for moderate to severe disease of the face and neck. Lotions may worsen dryness due to low lipid content; thick creams or ointments are preferred. Avoid using medium- or high-potency topical corticosteroids on the face or eyelids to prevent complications.
0 Comments
