It sounds like you may be experiencing a mild allergic reaction or sun-related skin irritation. To help relieve the itching and skin patches on your neck, you can try applying a cool compress to the area and avoid further sun exposure until the symptoms improve.

• Consider taking an oral antihistamine like levocetirizine (found in Xyzal Tablet) to reduce itching and allergic response, but only after consulting a doctor for proper dosage and suitability.
• Use a gentle, fragrance-free moisturizer to soothe the skin.
• Avoid scratching to prevent worsening or infection.

If the patches spread, worsen, or you develop other symptoms like swelling, difficulty breathing, or fever, seek immediate care. Otherwise, please consult a dermatologist for an accurate diagnosis and tailored treatment.To narrow down potential causes, we will need some more information.I understand that you developed small skin patches and itching on your neck while traveling in the sun. Can you please tell me your age and gender?