Self-Care and Pathophysiology of Dermatitis: ANP Study Guide

Dermatitis: Overview and Classification

Definition and Types

Dermatitis is a dermatologic condition characterized by erythema (redness) and inflammation of the skin. It is classified into several types based on etiology and clinical presentation:

• Irritant Contact Dermatitis (ICD): Caused by direct exposure to irritants.

• Allergic Contact Dermatitis (ACD): Resulting from immunogenic reaction to antigens.

• Atopic Dermatitis (AD): Also known as eczema, associated with hereditary and environmental factors.

• Diaper Dermatitis: A subset of ICD, commonly seen in infants.

Irritant Contact Dermatitis (ICD)

Pathophysiology and Etiology

ICD is an inflammatory reaction resulting from tissue damage when the skin is exposed to an irritant. Common occupational exposures include agriculture, healthcare, and manufacturing, where repeated contact with chemicals, acids, soaps, and sanitizers is frequent.

• Exposure: Can be single (strong irritants) or multiple (mild irritants).

• Localization: Symptoms are typically limited to the area exposed.

Clinical Presentation

ICD presents with erythema, edema, and stinging/burning of the affected skin. Lesions and rash are localized to the contact area.

Treatment Goals and Approaches

• Remove Irritant: Wash exposed area with tepid water and mild soap to reduce contact time.

• Symptom Relief: Use astringent soaks (e.g., Burow’s solution) for drying and cooling effects.

• Protect Skin: Apply emollients (petrolatum, ceramides) to restore moisture and prevent further exposure. Products with high lipid content are preferred.

• Itch Relief: Colloidal oatmeal can be used for itching; pat skin dry after use.

Prevention and Products to Avoid

• Prevention: Wear protective clothing, use emollients and barrier creams.

• Avoid: Topical corticosteroids (hydrocortisone) and anesthetics (caines) due to risk of allergic reactions.

When to Refer

• Children under 2 years

• Large body surface area involved

• Involvement of mouth, face, eyes, neck, or genitals

• Symptoms persist beyond 7 days

• Chronic symptoms

Diaper Dermatitis

Definition and Epidemiology

Diaper dermatitis is acute inflammation of the skin in the diaper area, primarily caused by urine and feces. It is the most common dermatologic issue in infants, but can occur in any age group with incontinence.

Clinical Presentation and Complications

• Red patches and lesions, maroon or purplish on darker skin

• Rapid onset

• If untreated, can lead to ulcerations, skin infections, or urinary/genital tract infections

Treatment Approach (Mnemonic: ABCDE)

• A: Air – allow diaper area to dry, include diaper-free time

• B: Barrier – use barrier cream liberally

• C: Clean – use soft cloth and warm water or appropriate baby wipe

• D: Diaper – change frequently, disposable preferred

• E: Educate – adults on hygiene and treatment options

Skin Protectants

Skin protectants provide a physical barrier and lubrication, decreasing friction and promoting healing. Common ingredients include petrolatum, zinc oxide, dimethicone, and lanolin.

Products and Ingredients to Avoid

• Powders: Cornstarch and talc pose inhalation risk.

• Hydrocortisone: Not recommended without medical referral due to risk of secondary infection and increased absorption.

• Caine ingredients: Risk of allergic reactions.

When to Refer

• Rash persists after 7 days of treatment

• Possible bacterial or fungal infection

• Broken skin or rash extends beyond diaper area

• Frequent recurrence

• Comorbid conditions causing immunosuppression

Allergic Contact Dermatitis (ACD)

Pathophysiology and Triggers

ACD is an immunogenic reaction when skin is exposed to an antigen. The reaction does not appear on first contact but develops after sensitization.

• Onset: 24 hours to 21 days in naïve patients; 24-48 hours in sensitized patients

Clinical Presentation

• Itching, erythema, edema

• Vesicles, bullae, papules (not seen in ICD)

• May or may not have burning/stinging

Urushiol-Induced ACD

Urushiol is found in poison ivy, oak, and sumac. Sensitivity is common, and cross-sensitivity occurs. The rash changes appearance over time and can be widespread.

Severe Cases and Complications

• Extensive edema, eyelid involvement, intense pruritus

• Numerous vesicles and bullae

• Secondary infections: S. aureus, Group A Streptococcus, E. coli

Treatment Goals and Approaches

• Remove Allergen: Wash contaminated items and exposed skin with mild soap and water within 30 minutes.

• Products: Dishwashing soap, urushiol-specific products, oil-removing cleansers (Goop).

Treat Inflammation

• Hydrocortisone cream (not ointment) for moderate, isolated rash

• Suppresses cytokines, histamine, and prostaglandins

• Do not use bandages or dressings

• Rx strength may be required for urushiol ACD

Hydrocortisone Adverse Effects

• Short-term use is key

• Topical withdrawal syndrome with continuous use

• Thinning of skin/atrophy (rare with OTC strength)

• Do not use on eyes/eyelids

Itch Relief and Debris Removal

• Cold or tepid soap-less showers

• Trim fingernails

• Colloidal oatmeal, calamine for drying lesions

• First-generation oral antihistamines for sleep

Products to Avoid

• Topical anesthetics and antihistamines: Increase sensitization/allergy

• Hydrocortisone for children under 2 years without referral

• Ointment formulation when oozing is present

Preventative Measures

• Identify Toxicodendron plants

• Wear protective clothing

• Wash clothing and skin after exposure

• Clip and clean nails

When to Refer

• Children under 2 years

• Numerous large bullae

• Intense pruritus, severe vesicle/bullae formation

• Swelling of body/extremity

• Eye/eyelid involvement

• Mucous membrane involvement

• Signs of infection

• No improvement within 7 days

Atopic Dermatitis (AD)

Definition and Epidemiology

Atopic dermatitis, or eczema, is characterized by erythematous, edematous, papular, and crusty skin. Patients often have xerosis (dry skin).

• 10-20% of children affected

• 80% have mild form

• Increased risk for asthma and allergic rhinitis

Pathophysiology

• Inflammation due to overexpression of inflammatory factors

• Mutation in filaggrin protein reduces skin barrier effectiveness

• Decreased lipids and ceramides impair moisture retention

• Hereditary: Family history in 70% of cases

Clinical Presentation

• Intense pruritus

• Dry, scaly, crusty skin

• Lesions may be papular and edematous

Treatment Approach

• Stop itch-scratch cycle: Trim fingernails, use colloidal oatmeal

• Moisturizing: Emollient application 3-4 times daily, especially post-shower

• Anti-inflammatory: Hydrocortisone topical (>2 years old), cream/lotion for weeping lesions, ointment for dry/scaly skin

• Barrier restoration: Creams and ointments preferred over lotions

Hydrocortisone Use

• Safe in children >2 years

• Apply thin film 1-2 times daily for 7 days

• Avoid eyes, eyelids, and compromised skin

• Do not wrap or band area

• Do not apply to diaper area

• Improvement expected in 24-48 hours

Skin Hydration

• Short baths (lukewarm), pat dry

• Drink plenty of water

• Maintain humid environment

Avoid Triggers

• Excessive skin washing

• Dyes, preservatives, irritating clothes

• Irritating soaps/detergents

• Hot showers

• Allergens, cosmetics/fragrances

• Cold/dry environment

Prevent Infections and Flare-Ups

• Trim, clean fingernails

• Sleep in "kid mittens"

• Maintain skin hydration

• Avoid triggers

Products to Avoid

• Topical antihistamines and caine products: Increase sensitization

When to Refer

• Moderate-severe condition with intense pruritus

• Large area involvement

• Children <1 year (or <2 years in practice)

• Signs of infection

• Face involvement

• Involvement of areas that rub together (axilla, groin, skin folds)

• No improvement after 2-3 days of treatment

Summary Table: Dermatitis Types and Key Features

Type	Etiology	Clinical Features	Treatment	When to Refer
Irritant Contact Dermatitis	Direct exposure to irritants	Erythema, edema, localized rash	Remove irritant, emollients, avoid corticosteroids	<2 years, large area, face/genitals, no improvement in 7 days
Diaper Dermatitis	Urine/feces, occlusion	Red patches, lesions in diaper area	Barrier creams, frequent diaper changes, avoid powders	Persistent rash, infection, broken skin, recurrence
Allergic Contact Dermatitis	Immunogenic reaction to antigen	Itch, erythema, vesicles/bullae	Remove allergen, hydrocortisone cream, avoid anesthetics	<2 years, severe symptoms, eye/mucous membrane involvement
Atopic Dermatitis	Hereditary, environmental	Pruritus, dry/scaly skin, papular lesions	Moisturizers, hydrocortisone, avoid triggers	Moderate-severe, infection, face, no improvement

Case Studies: Application of Concepts

Case of JD

• 54 y/o surgical nurse with irritated, dry, cracked hands, pruritus, erythema

• Likely ICD due to occupational exposure

• Self-treatment: Remove irritant, emollients, avoid corticosteroids

• Education: Protective measures, skin hydration, avoid triggers

Case of AJ

• 21 y/o college student with erythema, swelling, pruritus on ears after wearing new earrings

• Likely ACD due to sensitization to metal

• Self-treatment: Remove allergen, hydrocortisone cream, avoid triggers

• Education: Allergen identification, skin care, when to refer

Case of CS

• 28 y/o with persistent itching, dry/thickened skin, yellow exudates, crusting

• Symptoms worsened after moving; tried hydrocortisone without relief

• Not eligible for self-treatment due to infection signs

• Recommendation: Refer to PCP, maintain skin hydration, avoid triggers