We do not recommend stamping with the Hydra Needle and then using the M8 pen on the same area in the same session. Both products create micro-channels in the skin, so using them together may cause over-irritation, redness, or sensitivity. The Hydra Needle is mainly for light serum application and stamping. For acne scars, the M8 microneedling pen is usually the more controlled option because the needle depth and speed can be adjusted. Please do not use microneedling on active acne, inflamed skin, broken skin, or infected areas. Use a new sterile cartridge each time, start gently, and allow the skin to fully recover between sessions.