Why is tape over navel on stomach?

The umbilicus is often used as an access point for liposuction of the abdomen, in addition to other, because of its location as well as the ability to camouflage the scar in the depths of this anatomic site.

Yes, it is often used as a point of entry as the belly button helps to mask any potential scar. Hope this helps, Dr. Nazarian

Thank you for your question.  Plastic surgeons want to keep the incision is discreet locations such as in the underwear line, bra-line, or in creases/shadows that are well concealed.  An incision in the naval, allows for a well hidden scar and is a common access point for abdominal liposuction.  

If the pictures you were looking at our of liposuction then yes it is likely one small access point that can be hidden in the top of the bellybutton. If the pictures you were looking at are after a abdominoplasty then it may just be addressing to keep the clothing dry.