The best thing to do is start and aggressive belaching regimen along with strict sun protection using physical block sunscreens. I like Obagi. You should check with your docor so he r she can determine whether you have postinflammatory hyperpigmentation or melasma. If it is melasma, then you...
Begin with Melapads and Melarase PM for light pigmentation. If the pigmentation is severe in the armpits, opt for the Body Brightening kit followed by Clear and Brilliant lasers. Best, Dr. KaramanoukianLos Angeles