Definately get it checked babe. I had dd 18 months ago almost and my scar has been infected 3 times. Last time was about 3 months ago and it was so bad I was put on Antibiotics 3 times a day for 7 days, it was crap! My doctor told me because *COVER EYES IF YOU GET QUEEZY* i was literally POURING puss out of my wound cause it' had opened back up again, apparently there can be really deep infections under the scar and sometimes it takes a while for them to surface kwim? Before my last infection mine was sore, just felt like an ingrown hair.