Had a bridge put in 1.5 year. My gum is swollen first tooth on the left side between one of the teeth on my bridge. (photo)

My gum is swollen between my first tooth on the left side of my bridge. I also was never able to put my floss threader through the left side around that first tooth.. it wouldn't go in but was able to floss on the right side and the other teeth. Could this be a change of my gums or the bridge was placed wrong? I do have pain too when my air conditioner is on.