For acne scars, you usually need multiple sessions to see significant improvement. Light peels might require four to six sessions spaced two to three weeks apart, while medium peels might need two to four sessions. The number of sessions depends on how deep the scars are and how your skin responds to treatment. So yes, it can add up in terms of total cost, but many clinics offer package deals if you commit to multiple sessions, which can help reduce the overall expense.