My right ear goes down a bit on around that frequency (not tob100Db though). My audiologist suggested it may have been from shooting guns, which did a bit of, many years ago??
That is quite a drop. Wow. Well, “no follow up needed” is a dubious statement IMHO. Search out a qualified or different specialist for a different opintion. Audiologist just give you the text. They really aren’t qualified to diagnose, though some are well-informed. This definitely deserves a second opinion. You don’t need another audiogram - take the one you have to an ENT and ask what could cause such a drop. The comment about shooting guns was interesting.I played trumpet for many yers. Trumpet wouldn’t cause this, but if you were sitting next to the percussion section that could be a concern. All just IMHO.