Years after Lipo of arms, why are they wavy and lumpy?

The best way to correct post lipo deformities of the arm would be with a brachioplasty. In minor cases fat graft can help. This may have been over resected with the liposuction, although some people get contour abnormalities even if the procedure was done correctly.  

Thanks for your inquiry. 
Unfortunately, one of the risks of liposuction is having irregularities
in the skin.  It is important to see a
Board Certified Plastic Surgeon for your liposuction just to ensure that they
use the right technique because using the wrong technique like using a very
large cannula or sectioning superficially can all cause these
irregularities.  This is especially true
for areas like the arms that do not tend to have a lot of fat.  The irregularities are very difficult to
improve once they are there and after 8 years, they probably will not get
better on their own.  I would suggest a
consultation with a Board Certified Plastic Surgeon to further discuss your
options. 

Please post photos for further evaluation and treatment advice. I suggest seeing a VASER HI definition sculpting physician who can evaluate what type of procedure is needed and if revision and fat grafting are needed. Best, Dr. Emer.