Hello~I wouldn't worry, you would have to have the tight headphones on for days before this happens, and I don't think that headphones could ever be that tight. An example of tightness that could cause necrosis are a very tight band around the arm, leg, finger, etc. First, though, you would hurt very badly in the area where the band was, then, it would start changing color, finally, the area would turn black. All this would take a few days and you would know it.