If you're starting scalp microneedling, one of the first choices is the tool itself: a dermaroller or a microneedling pen. Both have been used in hair research, and both can work. But on the scalp, the differences between them matter more than you might think. Here's how they compare.
The short answer: dermarollers are cheaper upfront and were used in some of the best-known hair studies, but they can tangle in hair, give less consistent depth and are harder to keep clean. Microneedling pens move straight in and out, work neatly along partings, offer adjustable depth and use fresh sterile cartridges every session. For most people, a pen is the easier, more consistent choice for the scalp.
How each tool works
Dermaroller
A dermaroller is a handheld drum covered in fine needles. You roll it across the skin, and the needles enter and leave at an angle as the drum turns. Depth is fixed by the needle length.
Microneedling pen
A microneedling pen holds a cartridge of fine needles that moves rapidly straight up and down. You glide it along the skin, and depth is set on the pen. Each session uses a new, sterile cartridge.
Side-by-side for the scalp
| Dermaroller | Microneedling pen | |
|---|---|---|
| Working through hair | Can catch and tangle, especially in longer hair | Glides neatly along partings |
| Needle entry | At an angle as the drum turns | Straight in and out |
| Depth | Fixed per roller; varies with pressure | Adjustable and consistent |
| Hygiene | Reused, needs careful cleaning, needles dull over time | New sterile cartridge each session |
| Precision | Harder around the hairline and temples | Easy to follow the hairline |
| Comfort | Can drag or pull hair | Generally smoother |
| Upfront cost | Lower | Higher, plus cartridges |
| Use elsewhere | Usually one roller per area | One pen for scalp, face and body |
What about the research?
The well-known 2013 study on microneedling with minoxidil used a dermaroller, carried out in a clinic. So rollers can clearly work. But in a clinic, a trained practitioner controls pressure and technique and uses fresh equipment. At home, the advantages of a pen, such as consistent depth, easy use along partings and sterile single-use cartridges, make it easier to repeat that kind of controlled session yourself.
The hygiene question
Hygiene matters on the scalp, which is warm and often oily. Dermarollers are reused, so they need careful cleaning and replacing regularly, as needles dull and can bend. Bent or blunt needles can tear the skin rather than make clean channels. A pen with a new, sterile, sealed cartridge each time avoids these problems. See cartridge hygiene and safety.
Which should you choose?
A dermaroller might suit you if:
- you have very short hair or a shaved head
- you want the lowest upfront cost
- you're confident replacing and cleaning it regularly
A microneedling pen might suit you if:
- you have medium or long hair
- you want to work precisely along partings and the hairline
- you prefer adjustable depth and sterile single-use cartridges
- you'd like one device for your scalp, face and body
Scalp microneedling with Olapen
Olapen is designed to make scalp microneedling simple: adjustable depth from 0.6mm, a slim, cordless body that's easy to guide along partings, and 24-pin, 36-pin and 42-pin cartridges made for the scalp. For technique, see our scalp microneedling guide.
Frequently asked questions
Is a dermaroller or pen better for hair?
Both can work. Pens are generally easier to use consistently on the scalp, especially with longer hair.
How often should I replace a dermaroller?
Rollers dull with use and need replacing regularly. Follow the manufacturer's guidance and replace any roller with bent or blunt needles.
Can I use a dermaroller with long hair?
It's possible, but rollers can catch and tangle. A pen is usually easier.
What depth should I use on the scalp?
Start at 0.6mm with either tool.
Can I use the same tool on my face?
With a pen, yes, with a fresh cartridge for each session. With rollers, use separate ones for each area.
The bottom line
Dermarollers and microneedling pens can both play a part in a scalp routine. Rollers are cheaper upfront; pens offer more consistent depth, easier use through hair and better hygiene. For most people working on their scalp at home, a pen is the more practical choice.
Microneedling is a cosmetic procedure. It is not intended to diagnose, treat, cure or prevent any medical condition. If you have concerns about your hair or scalp, speak to a healthcare professional.