I scrubbed my 14-year-old’s neck with a flannel every evening just to get it clean: three weeks later, I understood what that dark velvet ring was actually measuring
Parents spend weeks scrubbing a dark ring around their teenager’s neck, only to discover it’s not dirt at all—it’s acanthosis nigricans, a skin marker signaling insulin resistance. This surprising condition affects roughly one in seven screened children and requires a doctor’s attention, not a washcloth.