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Thank you for your question. Derma roller is very good for acne scars as it can improve the texture and the appearance. The length of the needle all depends on what reaction you will have. Derma roller should be from .5-1.0 in length. With home derma rollers all you should experience is redness but this should return to normal after about 1 hour post rollering. Hope this helps.
If you have certain scars like atrophic scars, and if you perform the procedure correctly, you can have an improvement with rolling. This treatment works, however skin needling with controlled heating such as RF Needling (INFINI) works better. As for downtime following rolling- it depends on so many factors- depth of needles (0.25- 3.5mm), pressure, passes, technique, indiviudal factors, etc....can range from overnight to one week. All the bestDR Davin Lim Laser Dermatologist