What is the purpose of a faja? If I stop wearing it will it effect my results?

The best person to answer this question is your board certified PS as all PSs have varying post operative protocols.
My patients typically wear the garment as much as possible for six weeks.  Should the swelling resolve faster than usual, they will opt for a smaller size garment.  
Kenneth Hughes, MD, ABPS Board Certified Plastic SurgeonLos Angeles, CA

Dear princessasiaa,Thank you for your question. In the first 4 weeks after a tummy tuck and liposuction, a faja reduces swelling and prevents seroma (liquid) formation. I usually recommend my patients to wear a faja as much as possible the first 4 weeks. After that, I encourage them to wear a faja as much as they can tolerate up to 3 months after surgery. I do think the faja helps reduce swelling in active patients as they start exercise at the 6 week mark. As you can see from the answers, surgeons have various answers based on their beliefs and experience.Hope this helps,Nirmal R. Nathan, M.D.

Certified, American Board of Plastic Surgery

Member, American Society of Plastic Surgeons