Microderm crystals. Skin Doctors exfoliating exfoliating crystals offer an affordable way to carry out your microdermabrasion facials at home. With the added moisturisers, tea tree oil and antioxidants, the micro crystals help reduce facial scars and blemishes. It’s effective at removing blackheads and reducing the signs of ageing by removing dead skin cells. For a light exfoliation you can apply to wet skin and massage the exfoliating micro beads over your face with your hands. For a deeper exfoliation, apply with a purifying cleansing brush.