OK guys first time posting...but I did p90x and lost 100 pounds

in about a year and a half I find that I'm getting some loose skin around my stomach so I was wondering is working out abs with weights might help fill in that skin....I still can't see my abs but now afraid to lose more weight because if loose skin....I don't know anyone else that works out so no one to really ask THANKS SO MUCH GUYS

Male
5`11
175pounds