I recently got diagnosed with umbilical endometriosis after a long slog. I have also been treated for infertility and about to start my first cycle of ivf. Since having my operation 3 weeks ago the growth gas returned. I hear having the endometriosis in my belly button is rare but is it normal to return after surgury? I have not any further investigations to see where else I may have it. But I presume as it's in my belly button that's it's not the only place or will be? Any thoughts advise are welcome.