My son scraped his arm at the playground. I thought nothing of it and he carried on playing like normal. Hours later we were in hospital and doctors had to desperately save his life. This is the simple, easy-to-miss sign parents can't ignore

A child scraped his arm at a playground and hours later was rushed to the hospital where doctors had to save his life. The incident highlights a simple sign that parents should not ignore. The sign is related to a potential serious health issue.