Allergic reactions in the skin, often manifesting as rashes, hives, or dermatitis, result from the immune system's response to allergens. Common triggers include specific cosmetics, fragrances, metals such as nickel, and environmental elements like pollen and pet dander. Symptoms may include redness, itching, swelling, and in severe cases, blisters. Dermatologists play a crucial role in diagnosing and managing these reactions, often using patch testing to identify specific allergens. Treatment typically involves avoiding known triggers, applying topical corticosteroids to reduce inflammation, and taking antihistamines to alleviate itching. In cosmetology, it’s essential to choose hypoallergenic products to minimize the risk of allergic responses, ensuring safer skincare routines for sensitive individuals. Understanding the interplay between allergens and skin health is vital for effective management and prevention.