Hi,
Welcome to the ehealthforum and I am really glad to help you out. I can understand the pain and agony your bother is going through. Thereâs a possibility of him having an underlying infection. This is one of the commonest complications which can occur during the post-operative period.
This can vary from a minor infection of the stitch line to the formation of a fistula. You definitely need to consult a doctor/surgeon . He will likely need another course of antibiotics or a re-exploration of the wound. An ultrasound or a CT scan may help in ruling out the presence of an underlying abscess (collection of pus).
I sincerely hope this information helps. Take care.