scar opened up a hole and weeps out puss...

Hello,
Welcome to the ehealthforum and I am really glad to help you out.

If the scar of surgery had opened up after 6 weeks and pus is oozing then there is a possibility that the surgical site has got infected which has caused gaping of wound.

Please consult your surgeon immediately.Swab samples of the wound/incision line have to be taken and sent for culture-sensitivity along with blood culture to isolate the infecting organism.Then specific antibiotics-topical as well as oral have to be started.Till the report of the culture comes,the doctors will start with broad spectrum antibiotics.

Severe cases of wound gaping may require dressings for a longer period of time or even a resurgery to stitch the incision line together.

I must admit that it is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.