Soft threads above lips?

Hi I'm 32 and have a few lines starting above my lips (smokers lines- but I don't smoke) I'm just wondering I was told that soft threads can't cause the puckering the barb ones can is that true? It was advised to use soft threads rather than filler to build up my own collagen and not add unessassary volume. I would do laser but I'm on 20 mg every other day of isotretinoin for some stubborn hormonal acne. Is it okay to do threads on that medication if it's a really light dose? Thank you