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Without a first hand examination of the wound it is not possible to know if it just normal soakage associated with the surgery. Presence of issues like pain, tenderness, redness, foul smell and yellowish discharge will be indicators of a secondary bacterial infection. In such situation treatment with antibiotics and supportive medications as well as drainage of excess secretions or pus would also be needed.
You might immediately consult your treating doctor for a examination and seek appropriate advice.