Bonjour :-)
I wish my French was as good as your English!
Concerning your question about safety, I address a similar question here:
https://http://forums.owndoc.com/dermarolling-microneedling/Concerns-and-questions-regarding-dermarolling There really is no need to have the dermarolling done by a dermatologist. You can safely do it yourself.
You seem to have a mixture of boxcar- and rolling scars.
Boxcar-type of depressions are caused by tissue atrophy resulting from long-term inflammatory damage due to acne.
Rolling scars are caused by the epidermis being pull down to the subcutaneous layer by fibrous bands.
I would recommend a combination of a 1.5 mm dermaroller, a 0.5 mm dermaroller and the single needles.
Once every three to four weeks, use the single needles on your deepest scars and after that, roll your entire forehead densely with the 1.5 mm dermaroller. All in one session.
Roll the whole forehead twice a week with the 0.5 mm dermaroller.
After several months, you can add some kind of improvised suction:
https://http://forums.owndoc.com/dermarolling-microneedling/Subcision-suction-method-for-acne-scarsDbr />
Fraxel laser works according to the same principle as dermarolling. It makes micro-injuries to the skin, triggering the regeneration and remodeling of the skin. Fraxel "pricks" the skin thermically (it is more prone to hyperpigmentation, burns etc), a dermaroller does it mechanically
Please remember to give us your feedback on your results. We get many emails from customers saying that dermarolling/dermastamping/needling improved their acne scars, usually after at least a year of monthly rolling sessions. Unfortunately, nobody sent us any before and after photos as of yet. About a year ago I told my husband that one day I would like to needle acne scars (he has just a few) on his forehead and photo-document the process of improvement. He faintly nodded (to get rid of me). Some days ago I took the single needle and tried to catch my husband who saw the needle and promptly ran away. He said: "no way I am going to go through such an ordeal just because you need a photo. Find yourself another victim". Sigh.