Did my recruiter tell me to lie?

OK got some new info.I had a staph infection in my knee and had some fluid in it,According to my mom they just poked some holes while under general anesthesia and drained it.

When I brought this issue up with my recruiter he said not to worry since it was over 12 years ago and you can’t really see the scars.

Problem is the afsc i want will probably require a Top Secret Clearance,and those go real far.So will I be screwed?
well the infection created fluid in my knee.