0.2mm / 0.25mm / 0.3mm needle size is not really intended to treat wrinkles and scars. It is strictly used for boosting topical skincare product absorption. As a result, this will increase the concentration of topical active ingredients inside your skin.
0.5mm If you are looking to treat shallow wrinkle, scars, UV damage, and hyperpigmentation with the added benefit of boosting skin care product absorption, then you should look into using a 0.5mm roller. This is a popular roller for anyone looking to have multiple treatments on a monthly basis.
0.75mm to 1.0mm rollers can induce collagen growth more effective than 0.5mm. In addition to reducing sun damage and hyperpigmentation, these rollers are the perfect solution for treating shallow to deep wrinkles, scars, and stretch marks, cellulite.
1.5mm to 3.0mm rollers can treat DEEP / SEVERE scarring or stretch marks, cellulite. It is safer to use them on your body than on your face.
Dermarolling for Hair, Beard Loss & Regrowth
If you will use a derma roller with minoxidil or other hair loss treatment please choose between 0.2mm and 0.5mm. NEVER use a needle length longer than 0.5mm with minoxidil. If you will use derma roller only please choose between 0.5mm and 1.0mm.
Remember, the results of your derma roller treatment do not depend only on the needle size. These are just general guidelines that it is best to stick to as you start out with your treatments.