Calling all teachers

Are you comfortable with talking to someone in leadership at the school to discuss the best option?  The rumour mill can run rife through the kids (not to mention the teachers and parents) - it may be a good strategy to make sure the teachers you work closely with know what's going on and what you want divulged and let them know that you are happy for them to tell the kids as needed, or their parents - but a school leader may be able to give you guidance.  I think the statement that your hair doesn't like some medicine you are on that's different to other medicines is enough for young kids but I probably wouldn't volunteer it without them asking.  It's always good to be careful as you may not be aware of what a child has going on in their personal life and too much information, or that told in the wrong manner, could be traumatic.  (I say this as a parent knowing how well-meant but thoughtless statements by teachers have affected my kids and others.)