I had a similar problem when I had same op last year, this is fluid from the lymph nodes = think they call it seris fluid. Mine got infected and I needed a couple of courses of antibiotics to clear it.... more of an inconvenience than anything else, having to keep changing dressings. Get the nurse at the post op visit to have a look and take swabs to identify infection so they give you right anitbiotics. I got worried that all the swelling etc would make the scar wonky and tight, but it healed up fine in the end - medics are always commenting how neat it is now.
Good luck with your recovery, sure you will be fine, we are all here if you need support, only been on here a couple of days myself, and the camaraderie is amazing xxx
Just to add unfortunately the numbness takes aaages to go away, I still have some 14 months post op 😞