i can answer that for @thinou
Doesnt Matter you will do Hairremoval by IPL / Alexandritlaser/Diodlaser /YAG laser /ELOS Laser (/SHR (Super hairremoval).
You got general the Chance , laser stimulate Vellus hairs to be Terminal Hairs
Its from Internet just qoute it
What Causes the Unwanted Growth
Your body grows two types of hair. The long, dark hairs are called terminal hairs. These are the hairs laser removal targets. You’re also covered in vellus hairs. These are the thin, light hairs that make peach fuzz.
Vellus hairs are too pale to absorb heat from a laser. In theory, this means that laser light won’t affect them. In practice, however, some people find that their vellus hairs grow darker and coarser after hair removal treatment.
Doctors understand why hair removal treatments don’t destroy vellus hairs, but they don’t understand why the laser light sometimes stimulates them. One theory is that the heat from the laser injures vellus follicles but does not destroy them. Proponents of this theory believe that the damaged follicles heal themselves and start to create terminal hairs in the process.
Another theory, published by the American Society for Laser Medicine and Surgery, suggests that the laser may stimulate the growth of dormant stem cells that produce terminal hairs. More research is needed, however, to fully understand this phenomenon as it applies to hair removal treatments.
Prevention
The good news is that experts estimate only around 1 percent of those who undergo laser treatment notice darkening vellus hairs. The bad news, however, is that no one can promise you that you won’t be part of that 1 percent
The only guaranteed way of avoiding vellus hair darkening is to avoid treating areas where you have vellus hairs. Consider, for example, treating the hair on your lower leg but not your thighs, which are more likely to contain vellus hairs.
If you need to treat an area that contains vellus hairs, such as your chin or upper lip, consider a two-pronged approach. Use electrolysis to remove the vellus hairs and then use laser treatment to remove the terminal hairs you want rid of.
Expert Laser Hair Removal on Long Island
The best way to ease your concerns about this unwanted side effect of hair removal is to schedule a consultation with a laser hair removal expert.An experienced technician knows how to evaluate your individual situation and guide you towards your best hair removal solution.
From me :
Best Search for Laser:
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A Hairexpert /Dermatologist you Pay maybe More as in Studio but the One do it Very Good.
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Search a Good Studio, with Good feedback and Results
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Dont Pay to Less for for a Session if you pay like 60-80 Euro/Dolllar for full facial hairs its to cheap, maybe something wrong with it A Usual Price here is by 120 Euro for facial hairs. By Doctor You pay 120-200 Euro , at least in Germany. I Cant speak for other countrys.
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If you go in a Studio , Make Sure they have more than 1 Laser . Even inform yourself about the Laser. By Laser technologies it exist some Very Hard differents.
It exist some Laser , they work with different wave Lengths and the Strongest Laser i think they get produced in Isreal if i remember right. Found some once a Video like this. And by this Laser , the Hairs Fall Out instantly , after the treatment. You dont need to wait , weeks within they fall out. You have directly results. By Usual you need wait 2-3 weeks for any results.
Also you Should know, Laser Remove Most Hairs for Months/Year/s.
it will Regenerate Proparly over Years MINIMUM 20-60% Percentage of all Hairs, But General there is the Chance that XX% , get Destroyed (forever).
Vellus Hairs are Fine /Grey Hairs , you got them even in Face on Your Body they dont grow so much MAXIMUM 1-2 CM ( if i remember right).
You see them just in right light or if you go very close with your face , to the mirror.