Contact dermatitis is an itchy rash caused by direct contact with a substance or an allergic reaction to it. The rash isn't contagious, but it can be very uncomfortable. Many substances can cause this reaction, such as cosmetics, fragrances, jewelry and plants. The rash often shows up within days of exposure.
Symptoms of contact dermatitis include: Red, irritated skin. Itching. Swelling.
Allergic contact dermatitis is a type 4 or delayed hypersensitivity reaction and occurs 48–72 hours after exposure to the allergen. The mechanism involves CD4+ T-lymphocytes, which recognise an antigen on the skin surface, releasing cytokines that activate the immune system and cause the dermatitis.
The rash can develop within minutes to hours of exposure, and it can last 2 to 4 weeks. Signs and symptoms of contact dermatitis vary widely and may include: An itchy rash. Leathery patches that are darker than usual (hyperpigmented), typically on brown or Black skin.
Creams containing ceramides (eg, Impruv, Cerave, Cetaphil RESTORADERM) may be particularly helpful in restoring the epidermal barrier in persons with irritant contact dermatitis (ICD) and atopic dermatitis.
Examples of food allergens include mango, citrus fruit, and cinnamon. ❖ Atopic cheilitis is common in individuals with eczema or a history of eczema.
Atopic dermatitis and contact dermatitis are two common types of eczema that are often confused. While they are both inflammatory skin conditions that share similar symptoms, their causes are different. Atopic dermatitis is an internal skin condition, whereas contact dermatitis results from external factors.
There's no cure for contact dermatitis. If your body reacted to an allergen or irritant, you'll likely continue to have a similar reaction every time you're exposed to it. Avoidance is the best prevention for contact dermatitis.
Texture and timing are two key factors that can help differentiate between rashes and allergic reactions. Rashes often alter the skin's texture, leading to roughness or scaling. In contrast, allergic reactions may manifest as raised welts or hives, indicating an immune system response.
Topical steroids may resolve itching and other contact dermatitis symptoms, but if the rash is widespread, dermatologists may prescribe a short-term course of oral or injectable corticosteroids. Preventing future outbreaks depends on pinpointing—and then avoiding—the irritant or allergen that triggers flares.
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