Infection on C-Section Stitch line.

My Wife got some sort of infection on her C-Section Stitch line after two months of delivery. Initially, the stitch line was completely healthy. The Gynae also checked it and stated as "Healthy Stich line" in the prescription. But after 2 months of delivery the stitch started swelling and there was a watery discharge from the wound. If you refer to the images i have attached you can se that there's a small swelling above the stitch line at the end of the stitch, that too was discharging a clear watery fluid and there was a mild pain as well. Later, when we went to the doctor she told that it's an infection which occurred after 2 months of delivery and prescribed an anti-biotic tab Clarinova 500 twice daily for two months and Cream Noxa to apply on the wound. She also said that the cause is unknown. However, the medicine worked and the stitch line is far better than earlier and is recovering. My question is that, is this a serious issue or its normal? I am bit scared.