Dermarolling/microblading

Br

Has anyone ever heard of this and personally tried this, or know of someone who’s tried it? What were the results? Pros & cons? I’ve ordered a 1.5mm Derma roller and 100% pure hyaluronic acid to try on my stomach and thighs for stretch marks and cellulite, but plan on waiting until about a few months after baby is born (Aug baby) to start.