When using a derma pen It is essential to achieve an even endpoint by using a good needling technique. A poor technique can result in over treating or under treating some areas, leaving random uneven blotches. The aim is to ensure an even end result of a pinkish glow (pictured)
Contrary to the early days of microneedling where the desired end point was pinpoint bleeding, recent evidence has pointed to great success of shallow needle depths in achieving results. The takeaway here is don't over treat, less is best.
Also using a circular pattern is best practice rather than using a striping pattern. A circular pattern will ensure adequate and even outcome of a pinkness to the skin.
It is very important to apply sufficient hyaluronic serum on the treatment area surface to facilitate the gliding action of the microneedling device and to prevent untoward injury to the overlying epidermis. Gentle stretching of the skin with one hand as the device is lowered perpendicular to the skin, this will assist the smooth delivery of the micro needles into the skin.
We must also consider the number of passes you make to get your end result. There are many variables to consider such as the depth of needles, number of needles, device speed and skin thickness. And the fact that erythema (pinkness) can often be a delayed reaction, meaning your pinkish glow might not be visible during the process but appear soon after. As a general rule I prefer to air on the side of caution and recommend starting with 2-3 circular passes. You will soon get the hang of it and to know how your skin reacts, this will come with practice and experience and if you need to increase your passes you can adapt accordingly.
Here are instructions for cosmetic needling where the recommended cartridge depth is a shallow 0.2-0.4mm. Cosmetic needling is painless and a gentle way rejuvenate all skin types.