As hyaluronate is part of the building block of skin, any unevenness will get absorbed within 2-3 weeks.
Any shape discrepancy can be corrected by molding and discussion with you during the procedure with a mirror,
or touch up injection after 2 weeks. This is the advantage of fillers.
Most common complaint is fear of being too noticeable a change. The injection could be spaced out over 2 sessions in 2 weeks.
Rarely the artery to the lips can be affected, leading to lips atrophy.
Usually has minimal side effects.