CoolSculpting is a safe procedure, but some common side effects include: Redness: Temporary redness in the treated area. Swelling: Minor swelling that subsides over time. Tenderness: Soreness in the treated zone. Bruising: Mild bruising due to the suction and cooling process. Numbness: Temporary numbness in the treated area. Tingling or Stinging: Sensations like tingling or stinging, usually short-lived. Firmness: A firm feeling in the treated area. These side effects are typically mild and resolve on their own within days to weeks.