Contact Dermatitis: Clinical Presentation, Diagnostic Evaluation, Management, and Outcome – A Case Report

Abstract

Contact dermatitis is a common inflammatory skin disorder resulting from direct exposure to irritants or allergens that trigger cutaneous inflammation. It is characterized by erythema, pruritus, edema, vesiculation, scaling, and skin barrier dysfunction. The condition may significantly impair quality of life and occupational productivity, particularly when recurrent or chronic. Although contact dermatitis is generally benign, delayed diagnosis and continued exposure to causative agents may lead to chronic eczema, secondary infection, and persistent skin damage.

We present the case of a 35-year-old female who developed progressive itching, erythema, and scaling over both hands following repeated exposure to household cleaning products. Clinical evaluation, exposure history, dermatological examination, and patch testing confirmed allergic contact dermatitis. The patient was successfully treated with allergen avoidance, topical corticosteroids, emollient therapy, and patient education, resulting in complete clinical recovery.

This case highlights the importance of detailed exposure history, accurate diagnosis, patch testing, and preventive strategies in achieving favorable outcomes in patients with contact dermatitis.

Introduction

Contact dermatitis is an inflammatory skin disease caused by exposure to exogenous substances that either directly damage the skin barrier or induce a delayed hypersensitivity reaction. It is one of the most common dermatological conditions encountered in both primary care and specialist practice.

The condition is broadly classified into:

• Irritant Contact Dermatitis (ICD)

• Allergic Contact Dermatitis (ACD)

Irritant contact dermatitis results from direct chemical or physical injury to the skin, whereas allergic contact dermatitis is a T-cell-mediated delayed hypersensitivity reaction that develops after sensitization to an allergen.

Predisposing factors include:

• Frequent hand washing

• Occupational chemical exposure

• Household cleaning products

• Cosmetic products

• Metal exposure

• Rubber products

• Preservatives and fragrances

• Atopic skin conditions

Clinical manifestations range from mild erythema and itching to severe vesiculation, fissuring, and chronic lichenification. Accurate diagnosis and early intervention are essential to prevent chronic disease and recurrence.

Case Report

Patient History

A 35-year-old female presented to the dermatology outpatient department with complaints of:

• Intense itching over both hands for 3 weeks

• Redness of the skin

• Dryness and scaling

• Burning sensation after cleaning activities

• Painful skin cracks near the finger joints

The symptoms had gradually worsened despite the use of over-the-counter moisturizers.

The patient reported daily exposure to household cleaning agents and detergents without using protective gloves.

The patient denied:

• Fever

• Joint pain

• Oral ulcers

• Drug allergies

• Recent infections

• Previous dermatological disorders

Past medical history was unremarkable.

There was no family history of psoriasis, eczema, or autoimmune disease.

Clinical Examination

General Examination

• Blood pressure: 118/76 mmHg

• Pulse rate: 82/min

• Respiratory rate: 16/min

• Temperature: 98.4°F

• Oxygen saturation: 99% on room air

The patient appeared comfortable and clinically stable.

Dermatological Examination

Examination of both hands revealed:

• Well-defined erythematous plaques

• Fine scaling

• Excoriation marks

• Mild edema

• Superficial fissures

• Dry and rough skin texture

• No purulent discharge

• No evidence of secondary infection

The lesions were predominantly distributed over the dorsal surfaces of both hands and fingers.

Nails and mucosal surfaces appeared normal.

Clinical Evaluation

Differential Diagnosis

The following conditions were considered:

• Allergic contact dermatitis

• Irritant contact dermatitis

• Atopic dermatitis

• Psoriasis

• Tinea manuum

• Dyshidrotic eczema

The temporal relationship between cleaning product exposure and symptom exacerbation strongly suggested contact dermatitis.

Investigations

Laboratory Evaluation

Routine investigations revealed:

• Hemoglobin: 12.9 g/dL

• Total leukocyte count: 8,400/mm³

• Platelet count: 276,000/mm³

• ESR: 18 mm/hr

• CRP: 4 mg/L

Laboratory parameters were within normal limits.

KOH Examination

Skin scrapings were examined for fungal infection.

Results showed:

• No fungal hyphae

• No dermatophyte infection

Patch Testing

Patch testing was performed using a standard allergen panel.

Results demonstrated:

• Positive reaction to fragrance mix

• Positive reaction to preservative compounds

• Delayed hypersensitivity response at 48 hours

• Persistent positivity at 72 hours

Dermoscopy

Dermoscopic examination revealed:

• Diffuse erythema

• Fine scaling

• Superficial epidermal disruption

• No features suggestive of psoriasis

Diagnosis

Based on clinical findings, exposure history, dermatological examination, and patch test results, a diagnosis of: Allergic Contact Dermatitis Secondary to Household Cleaning Agents was established.

Management and Outcome

Initial Management

The patient was advised:

• Immediate avoidance of triggering cleaning agents

• Use of protective gloves during household work

• Regular application of emollients

• Skin barrier protection measures

Medical Therapy

Treatment included:

• Topical Mometasone Furoate 0.1% cream once daily

• Intensive moisturization with ceramide-containing emollients

• Oral Cetirizine 10 mg daily for itching

• Soap substitutes for hand hygiene

The patient was educated regarding avoidance of fragranced products and potential cross-reactive allergens.

Hospital Course

At 1 Week

• Significant reduction in itching

• Decreased erythema

• Improved skin hydration

At 3 Weeks

• Marked reduction in scaling

• Healing of fissures

• Resolution of burning sensation

At 6 Weeks

• Near-complete resolution of lesions

• No new eruptions

• Restoration of normal skin texture

Follow-Up

At 3 Months

• Complete symptom resolution

• No recurrence

• Excellent compliance with allergen avoidance measures

• Improved quality of life

Discussion

Pathophysiology

Contact dermatitis develops when environmental agents disrupt skin barrier integrity or induce an immune-mediated inflammatory response.

In allergic contact dermatitis:

• Allergens penetrate the epidermis

• Langerhans cells process allergens

• Sensitization of T lymphocytes occurs

• Re-exposure triggers delayed hypersensitivity

• Inflammatory cytokines produce dermatitis

The resulting inflammatory response causes erythema, itching, edema, and epidermal damage.

Epidemiology

Important epidemiological features include:

• One of the most common occupational skin disorders

• More frequent among women

• Common in healthcare workers

• Common in cleaning professionals

• Significant impact on quality of life

• Increasing prevalence due to exposure to chemicals and cosmetic products

Clinical Manifestations

Common symptoms include:

• Pruritus

• Erythema

• Scaling

• Burning sensation

• Edema

• Vesiculation

• Fissuring

• Dry skin

Chronic disease may result in:

• Lichenification

• Hyperpigmentation

• Secondary infection

• Persistent eczema

Diagnostic Considerations

Diagnosis relies on:

1. Detailed exposure history
2. Clinical examination
3. Identification of triggers
4. Patch testing
5. Exclusion of fungal infections
6. Dermatological assessment

Patch testing remains the gold standard for confirming allergic contact dermatitis.

Treatment Modalities

Medical Therapy

Most patients respond to:

• Topical corticosteroids

• Emollients

• Antihistamines

• Barrier repair therapies

Allergen Avoidance

The most important intervention includes:

• Identification of offending allergens

• Avoidance of exposure

• Use of protective equipment

• Patient education

Systemic Therapy

Reserved for:

• Severe disease

• Extensive dermatitis

• Refractory cases

Potential options include:

• Oral corticosteroids

• Immunosuppressive therapy

• Biologic agents in selected cases

Complications

Potential complications include:

• Chronic eczema

• Secondary bacterial infection

• Skin fissuring

• Occupational disability

• Sleep disturbance

• Reduced quality of life

Early diagnosis significantly reduces long-term morbidity.

Prognosis

Prognosis depends upon:

• Early identification of allergens

• Patient compliance

• Severity of exposure

• Chronicity of disease

• Adequacy of skin protection

Most patients achieve excellent outcomes when trigger avoidance and appropriate therapy are implemented.

Conclusion

Contact dermatitis remains a common but often preventable inflammatory skin disorder. Careful exposure history, thorough clinical evaluation, and patch testing are critical for accurate diagnosis and identification of causative allergens. This case demonstrates the successful management of allergic contact dermatitis through allergen avoidance, topical corticosteroid therapy, skin barrier restoration, and patient education. Early recognition and preventive measures remain essential for preventing chronic disease, minimizing complications, and ensuring favorable long-term outcomes.

References

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2. Johansen JD, Aalto-Korte K, Agner T, et al. European Society of Contact Dermatitis guideline for diagnostic patch testing. Contact Dermatitis. 2015;73(4):195-221. https://pubmed.ncbi.nlm.nih.gov/26395552/
3. Thyssen JP, Linneberg A, Menné T, Johansen JD. The epidemiology of contact allergy in the general population. Contact Dermatitis. 2007;57(5):287-299. https://pubmed.ncbi.nlm.nih.gov/17937743/
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