Itching and rashes may be caused by allergy, infection, or skin irritation, and treatment depends on the cause. Avoid scratching the affected area and keep it clean and dry. Also, avoid using new soaps, creams, or products that may worsen the rash. Consult a doctor to identify the cause and recommend suitable treatment.

Fexofenadine (Allegra) is designed to last 24 hours, but if your allergic trigger is strong, symptoms can recur as the drug's peak levels begin to decline. Regarding your blood pressure, hypotension is not a side effect of fexofenadine. Rather, low blood pressure can be a serious complication of a severe allergic reaction, known as anaphylaxis. If you are experiencing low blood pressure, dizziness, or trouble breathing, please seek emergency medical attention immediately.

To help ease the pressure in your ears, a warm compress and nasal saline sprays can be very helpful. For the sore throat, warm saltwater gargles and staying well-hydrated work wonders. Over-the-counter pain relievers like paracetamol or ibuprofen can reduce discomfort. Since these symptoms are recurrent, it is highly recommended to see a healthcare professional. They can check for underlying causes like allergies or a sinus infection and guide you toward a lasting solution.

Since antihistamines and antifungals haven't helped, a key consideration is scabies, a very common and highly treatable skin condition caused by tiny mites. Other possibilities include contact dermatitis or a viral rash. I highly recommend visiting a healthcare provider for a physical exam. If it is scabies, they can prescribe highly effective targeted treatments, such as topical permethrin cream or oral ivermectin. Washing your clothes and bedding in hot water will also help clear it.

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.

Both fexofenadine (Allegra) and levocetirizine (Teczine) are generally considered safe during breastfeeding because only tiny amounts pass into breast milk. However, taking Allegra 180mg twice daily alongside Teczine 10mg is a very high combined antihistamine dose. While generally safe, such high doses can occasionally cause mild drowsiness in your five-month-old or slightly decrease your milk supply. Please monitor your baby for any unusual sleepiness or changes in feeding. I highly recommend consulting your doctor or pediatrician to confirm if this combined dosage is necessary or if a lower, safer dose would successfully clear your rash.