Some clients experience redness that may last for 12 to 24 hours on average. It is important to protect the skin with a broad spectrum SPF50+ sunscreen. Side effects are minimal, including mild swelling, mild bruising and peeling. These effects are actually normal and increase the blood, oxygen, collagen and elastin flow to the area. These visible effects usually only last for a day or so. It is very important to protect the skin with a broad-spectrum sunscreen SPF50+ after the treatment.