* Online booksellers: Websites like Amazon, Goodreads, and Barnes & Noble allow you to search for books by keyword. You can try searching for phrases like "peanut allergy YA", "nut allergy YA", or "allergic protagonist YA".
* Library databases: Your local library may have a searchable online catalog where you can search for books using similar keywords.
* Book blogs and websites: There are many websites and blogs dedicated to young adult literature. You can search for reviews or recommendations for books featuring characters with allergies.
* Social media: You can join book clubs or groups on social media and ask for recommendations.
* Talk to librarians or booksellers: Ask for their recommendations or help finding books with characters facing specific challenges, such as allergies.
Remember, books featuring specific medical conditions are not always categorized with those keywords. You may need to do some digging to find the perfect fit!