I am 20 yrs old and I've had a thumb sucking habit since childhood. How can I reverse the effects?

Hello, large lips regardless of how they were caused can be reduced in size by lip reduction surgery. This involves removal of a partial portion of the lip with incisions hidden towards the inside of the lip. This is done under local anesthesia as a same day procedure. Thanks. 

Lip reduction is very simple surgery done in local anesthesia. Reduction of  one or both upper and lower lip as well as correction of lip asymmetry with lip reduction on one side and lip augmentation on other side falls into this category. Scar is always placed within inner aspect of the lip that is not visible when smiling. Consultation with a board certified plastic surgeon with good reputation in facial rejuvenation surgery should be your next step. Good luck.