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Dermatitis: Causes, Symptoms and Treatment
Dermatitis is an inflammation of the skin causing redness, itching, and scaling. It can occur acutely or chronically and has a wide range of underlying causes.
Add as Preferred SourceThings worth knowing about "Dermatitis"
Dermatitis is an inflammation of the skin causing redness, itching, and scaling. It can occur acutely or chronically and has a wide range of underlying causes.
What is Dermatitis?
Dermatitis is a general term for inflammation of the skin, characterized by redness, itching, swelling, and changes in skin texture. It is one of the most common skin conditions worldwide and can affect people of all ages. Dermatitis may occur as a short-term (acute) reaction or develop into a long-term (chronic) condition that requires ongoing management.
Types of Dermatitis
There are several distinct forms of dermatitis, each with different causes and presentations:
- Atopic Dermatitis (Eczema): A chronic inflammatory skin disease with a genetic component, often associated with allergies and asthma.
- Contact Dermatitis: Caused by direct skin contact with irritants (irritant contact dermatitis) or allergens (allergic contact dermatitis).
- Seborrheic Dermatitis: Affects oily areas such as the scalp and face, causing flaking and redness.
- Stasis Dermatitis: Develops due to poor circulation, typically affecting the lower legs.
- Nummular Dermatitis: Presents as coin-shaped, itchy patches on the skin.
Causes
The causes of dermatitis vary depending on the type:
- Genetic predisposition and a compromised skin barrier function
- Allergic reactions to substances such as nickel, latex, fragrances, or preservatives
- Exposure to chemical irritants (e.g., detergents, solvents, acids)
- Environmental factors such as dry air, temperature changes, or UV radiation
- Psychological stress, which can trigger or worsen flare-ups
- Bacterial, fungal, or viral infections
- Overactive sebaceous glands (in seborrheic dermatitis)
Symptoms
Symptoms can vary widely depending on the type and severity of dermatitis:
- Redness and warmth of the affected skin areas
- Intense itching, which may worsen at night
- Dry, flaky, or cracked skin
- Blisters, oozing, or crusting during acute phases
- Skin thickening and roughening with chronic exposure (lichenification)
- Swelling and a burning sensation
Diagnosis
Dermatitis is primarily diagnosed through a clinical examination and a thorough medical history. Additional diagnostic tools may include:
- Patch Testing: Suspected allergens are applied to the skin under adhesive patches and assessed after 48 to 72 hours to detect contact allergies.
- Blood Tests: Measurement of Immunoglobulin E (IgE) and specific allergy antibodies, particularly in suspected atopic dermatitis.
- Skin Biopsy: A small tissue sample may be taken in unclear or atypical cases.
- Exclusion of similar conditions such as psoriasis or tinea (fungal infection)
Treatment
Treatment depends on the type, severity, and individual triggers of dermatitis:
Basic Skin Care
Regular use of moisturizing and emollient creams is the cornerstone of any dermatitis treatment. These products help restore the skin barrier, reduce water loss, and alleviate itching.
Pharmacological Treatment
- Topical Corticosteroids: Anti-inflammatory creams or ointments that quickly reduce redness and itching. Systemic forms (tablets or injections) may be used in severe cases.
- Calcineurin Inhibitors: Agents such as tacrolimus and pimecrolimus reduce skin inflammation without the long-term side effects associated with corticosteroids.
- Biologics: Targeted therapies such as dupilumab modulate specific immune pathways and are approved for moderate to severe atopic dermatitis.
- Antihistamines: Help relieve itching, especially at night.
- Antibiotics or Antifungals: Prescribed when a secondary bacterial or fungal infection is present.
Trigger Avoidance
Identifying and avoiding personal triggers -- such as specific allergens, irritants, or stress factors -- is an essential part of long-term management.
Additional Therapies
- Phototherapy (Light Therapy): Controlled UVB radiation can be effective for chronic forms of dermatitis.
- Psychosomatic Support: Psychological counseling may be beneficial when stress plays a significant role in disease activity.
References
- Wollenberg A. et al. - European guideline (EDF/EADV) on atopic eczema, Journal of the European Academy of Dermatology and Venereology, 2022.
- Johansen J.D. et al. - Contact dermatitis: Clinical practice and guidelines, Springer, 2021.
- World Health Organization (WHO) - Skin conditions overview, who.int, 2023.
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