HydraFacial is significantly gentler than microdermabrasion or strong chemical peels because there's no abrasive crystal or harsh acid left on the skin for long periods. It uses a mild glycolic/salicylic blend that's immediately vacuumed away, so you get the exfoliation without the prolonged irritation. Most people just have a slight pinkness that fades within an hour. For pore size, it's important to manage expectations – it doesn't physically shrink pores (that's genetic), but it cleans out the gunk that stretches them, so they appear smaller and tighter. With regular treatments, that effect can last quite a while, but you'll need maintenance every 4-6 weeks.