I did hernia operation 4 years ago and the stitches I had dodnt have any issues.suddenly lat couple of days I see the stitches are a bit swollen in ends and it pains ehen I touch the swollen part..pain is not inside..only in skin level..I dont remember hurting that place
Here this swelling and pain could be related to re herniation. As well if it's painful there might be infection too. You need to do ultrasound once again to check the position of previous operation done. Whether it is all well or it is disturbed. Here you have not mentioned which hernia it was or where the stitches are kept so not able to help you much. But will suggest you must visit your doctor once again if possible the same doctor who have done surgery first time. Ibsuggest do not delay and visit your doctor as early bad possible because of there is infection then it can be dangerous. And you need immeimmediate treatment. Take care.