Hello there, I am dr.milan an infectious disease specialist answering your question, This watery fluid coming is of two type either infection or noin-ifectious, inflammatory. If infection is there it cause associated symptoms like fever and bodyache etc. Sometimes it is inflammatory because there is cut has been made and presence of stitches cause local irritation cause serous(watery) fluid from there by inflammatory response of our body. You should go for culture examination of that watery fluid along with complete blood count to rule out infection. I advise you to maintain hygienic cleaning of wound and take rest along with healthy diet. Please Follow your surgeon s opinion. Hope i have given appropriate guidance to you. if you have any query you can consult me anytime. Give me star rating according to your satisfactory level. Thanking you.