DS is in primary school and recently said his hair was itching and I found nits. I treated him and got rid of them, but when I asked the teacher to send out a notice to let other parents know to check and treat their children, they said it was not something they would get involved in. My only option is to put a message on the class Whatsapp but DS would be very embarrassed and doesn't want me to. AIBU to think it's usual for the school to put out an anonymous message to let the class know?