This area is often a combination of loose skin and excess subcutaneous fat.Some women have excess breast tissue in their armpits as well.This area can respond nicely to liposuction.For those who have an excess of loose skin, liposuction becomes limited.I don't know why you would plan on gaining weight unless you're currently underweight. If your weight stays the same, your results should be permanent.Best of luck,Mats Hagstrom, M.D.