I had a skin pen treatment 5 and a half months ago. I still have needle holes on my cheek. Will they fill in and heal still?

I suggest seeing an expert for treatment, as a combination approach is needed for the best outcomes.  Posting before and after photos in the same standardized light would be helpful.  Best, Dr. Emer

Yes, this can happen to any fractional device including needling, erbium and CO2 laser - among many others. This is rare but well known side effect. Most cases settle within 6-12 months. Photos are essential - always objective follow up not subjective. I do intervene at the 9 month mark IF no improvement. Small beam NA lasers are best- overpass 1927 in Diode or Thulium. Be guided by your dermatologist or plastics. Dr Davin S. Lim. Brisbane. Australia. 

It is abnormal for microneedling to cause permanent facial scarring, due to the fact that the instrument uses such small needles to create the tiny holes in the skin’s surface. This intentional and controlled injury stimulates new collagen growth, making the skin stronger over time. In your situation, I would be curious to see the before and after pictures. It could be that the the needle size was too big, if it truly is leaving you lasting marks. If it was the correct needle size, and the correct technique was used (assuming you do not typically have abnormal scarring history) I would say the marks should improve. I would definitely mention this experience prior to your next treatment, if you chose to have microneedling done again in the future.