Skin Issues: Allergies, Hives, and Antihistamine Side Effects - Dermatology

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Hello! It sounds like you're experiencing some skin issues that can be quite bothersome, especially with your history of chronic urticaria (hives). Let's break down your questions regarding allergies, hives, and the side effects of antihistamines.

Firstly, the rash you see when the weather gets hot could indeed be a sign of an allergic reaction or hives. Hives, or urticaria, are raised, itchy welts that can appear on the skin due to various triggers, including heat, stress, certain foods, medications, or environmental factors. Since you have a history of chronic urticaria, it’s possible that the heat exacerbates your condition. Allergies can also manifest as rashes, but they typically involve other symptoms such as swelling, redness, and sometimes even respiratory issues, depending on the allergen.

Regarding the long-term use of antihistamines, it’s important to note that while these medications are generally safe and effective for managing allergic reactions and hives, they can have side effects, especially with prolonged use. Common side effects of first-generation antihistamines (like diphenhydramine) include drowsiness, dry mouth, dizziness, and sometimes urinary retention. Second-generation antihistamines (like cetirizine or loratadine) are less sedating and tend to have fewer side effects, but they can still cause fatigue or headaches in some individuals. Long-term use of any medication should always be monitored by a healthcare provider to ensure that the benefits outweigh any potential risks.

As for your question about "皮癢症" (pruritus) and "單純性癢疹" (simple pruritic rash), both terms refer to skin itchiness. Pruritus is a general term for itching, which can be caused by various conditions, including dry skin, allergies, insect bites, or skin diseases. A simple pruritic rash may refer to a localized area of itching that could be due to irritants or allergens, while pruritus can be more widespread and associated with systemic conditions.

If you are experiencing persistent itching or rashes, it would be wise to consult with a dermatologist or allergist. They can help identify the specific triggers for your symptoms and recommend appropriate treatments, which may include topical corticosteroids, moisturizers, or adjustments to your antihistamine regimen.

In summary, your skin issues could be related to your chronic urticaria, and the heat may be a triggering factor. Long-term use of antihistamines can have side effects, but they are generally safe when used as directed. Itching can arise from various causes, and it’s best to seek professional advice for a tailored treatment plan. Remember to keep your skin moisturized and avoid known triggers when possible. Take care, and may you find relief from your symptoms soon!