You don't have TSS crazy. You would have experienced the symptoms by now. You would have experienced them within two weeks of surgery at most. I was trained as a medic. Trust me. You're fine. Talk to a doctor about getting them removed.
I emailed your question to a friend of mine at Texas Tech because I'm not entirely sure about the time frame.
about 5 years ago I had this bump on my belly button, so like any guy I intend to pick at it. humm? it got worse and wouldnt go away but wasnt geting infected, so I poked at it with the tip of a pin, prricking it, It was like a hard hair. NO its a stitch.. I managed to pull it put it modified tweezers and a exacto knife.. after futher inspection I come to conclude it was a Plastic and It could only have gotten there at Birth...now surfacing 30 years later... stitches that disolve just take time..idk?