According to Cleveland Clinic: "Weight loss or gain: If you lose a lot of weight, you may have extra, looser skin. If you gain weight, you may have bigger cheeks. Both situations can accentuate nasolabial folds."
https://my.clevelandclinic.org/health/diseases/23027-nasolabial-folds
If you have gained 12 lbs. overall, the result should not be a deeper nasolabial fold than before. Are you asking if the skin lost elasticity because you gained and lost weight?