The derma roller has multiple uses for the skin, depending on needle length and purpose: 1. Stimulating Collagen and Skin Regeneration • Used for long needles (0.5–1.5 mm) to stimulate collagen production. • Helps reduce wrinkles and fine lines. • Beneficial for mild scars like acne scars. 2. Improving Product Absorption • Short needles (0.2–0.3 mm) make the skin more absorbent to serums and creams. • Used with Vitamin C, hyaluronic acid, or any nourishing skin serum. 3. Reducing Pores and Evening Skin Tone • Improves the appearance of uneven skin and reduces pore size. • Can help reduce mild pigmentation or spots. 4. Treating Acne Scars or Stretch Marks