Will your lips go back to normal after injections? Will the skin keep its tautness or do you end up with loose skin?

I feel a bit stupid for asking this question - since it is driven by an article on Cosmo. I have been getting injections for about 2 years. I went in a little early, & lips are bigger than before. Does skin on the lips & it's elasticity and ability to go back to normal. Does that skin tend to go back faster or better than other skin on the body or the same? I have loose skin (I had two breast lifts because my skin is so loose). I am no worried that my lips will not go back to normal.