After 10 years a stitch has now pierced my skin. Should this happen?

I had this procedure over 10 years ago and have always had pain in my breast. A lump appeared and grew large so I went to the doctors and have been referred to have it checked. But yesterday I felt a sharp pain in my breast and found a sharp object peircing my skin and poking out. I’ve been to a and e or have given me antibiotics as I have a bad infection and I’ve been referred to a breast specialist. But surely this should not have happened?