I hope it's scar tissue or infection... with that much trouble going on I think it could very well be infection. Stuff like that can become systemic and travel. Hopefully that's all it is. The troubling thing someone posted recently is the HPV+ Scc despite responding well seems to come back more frequently which makes me wonder if maybe they shouldn't throw a different type of chemo into the mix along with the cysplatin in terms of trying to KILL the virus. Viruses can stick around in a dormant state. Maybe this is what is happening here. So what seems to be a five year window for most cancers as being a cure time, may be relevant with a NON virus related cancer, but may not be quite so relevant with an virus related cancer. I hope research proves this to be wrong. best of luck and prayers to you both.