What are these hard lumps next to my bellybutton after Lipo?

It is far too early to be worried. Most likely you are feeling scar tissue as well as dead fat that will go away in time. Massage and be patient. 

Because of the difference in subcutaneous architecture near the umbilicus postoperative swelling can create significant firmness. This will resolve with time although will not follow the same timetable as the rest of the skin and fat of the abdomen.

It is very common to have bruising and swelling for weeks to months after liposuction procedures. What is most important is that you follow your surgeons post operative instructions and continue compression. If you are concerned, lymphatic massage and Velashape or Venus Legacy treatments can be used to improve the swelling and help the skin tighten. My patients start treatments right away and it improves the long term results. Speak to your physician if you are concerned. Best, Dr. Emer.

In regards to the hard lumps
next your belly button, you should still continue to follow up with your Plastic
Surgeon to discuss your concerns.Sometimes these hard lumps are swelling that can be massaged.In other cases, the lumps may be residual fat
that can be treated with Velashape or other similar treatments.

Thank you for your question, and congratulations on your liposuction procedure! It is very normal and expected to have swelling, uneven areas, firm areas, and numb areas immediately after liposuction. You are still in the inflammatory phase and will be swollen for a few more weeks. All of this is a normal process after liposuction and takes 6 weeks to 6 months to resolve. Keep in touch with your plastic surgeon who can guide and reassure you through the process, but try as hard as you can not to get worried about uneven or firm areas until you are fully healed (6 months). Best of luck!