Hand, foot, and mouth disease typically resolves within 7 to 10 days, and the rash spreading can be a normal part of the process before it heals. While it is wonderful his fever has subsided, his continued vomiting is important to address. Because vomiting can lead to dehydration in a 17-month-old, please contact his pediatrician for a quick evaluation. In the meantime, continue the hydroxyzine (Atarax) and calamine to keep him comfortable, and offer small, frequent sips of fluid.

Allegra (fexofenadine) is an antihistamine that temporarily blocks the chemicals causing your symptoms, but it does not cure the underlying trigger. When the medication wears off, or if you are continuously exposed to the allergen, your symptoms can return. Since taking 180 mg twice daily is higher than the standard dosage, it is very important to consult a healthcare professional. They can help identify the root cause of your symptoms and guide you toward a safer, more effective long-term treatment plan.

Since it has not improved after two days of fexofenadine (Allegra) and Nycil, and is spreading from your stomach to your neck, it is important to have a doctor evaluate it. This could be an allergic reaction or another skin condition requiring specific prescription treatment. Please stop using Nycil for now, keep your skin cool and clean, and avoid scratching. I highly recommend visiting a healthcare provider or dermatologist promptly for a proper diagnosis. If you experience any swelling of your face or difficulty breathing, please seek emergency medical care immediately.

Since fexofenadine (Allegra) is no longer helping, you might try cetirizine or loratadine, which are effective, daily non-drowsy antihistamines. The skin darkening you are experiencing is likely post-inflammatory hyperpigmentation, a common and temporary response to skin inflammation and scratching that typically fades once the itching stops. To soothe your skin, cool compresses or a mild hydrocortisone cream can help. Consult a healthcare provider to safely adjust your treatment and ensure you find lasting relief.

The redness after scratching sounds like a common, treatable condition called dermographism. Since fexofenadine (Allegra) didn't provide relief, you might find comfort by applying cool compresses or moisturizers containing colloidal oatmeal. For daily care, use mild, fragrance-free cleansers and avoid hot showers. Since the itching returned, I gently recommend discussing other daily generic antihistamines, like cetirizine or levocetirizine, with your doctor to find the right fit for your sensitive skin. A dermatologist can help tailor a plan just for you.

After chickenpox, itching can persist as the skin heals and new skin forms. You can keep the skin moisturised, avoid scratching, and use gentle soaps, but if itching is severe or accompanied by new rashes, consult a doctor for proper evaluation.