There are at least four factors related to laser tattoo removal.
Color, thickness, depth, skin strength etc .. Regarding color, if red and black, it is almost always possible to remove almost by repeating the number of times.
On the contrary, green, pink, purple and others are difficult to completely remove.
If it is a tattoo where most of these colors are occupied, it may be realistic to cut out (cut) or shave.
Even with black tattoos, thick pigmented tattoos require more treatment. Laser is destroying the top layer only every time.
For depth, for example, shallow pigments that amateurs put in tends to be easier to remove than dyes that are much deeper.
Finally, although it is the strength of the skin, it is sometimes the case that the laser is irradiated, the skin after the treatment rises unevenly.
Even if you use the laser at discreet power in such a case, there may be marks on the skin.
In actual treatment, we decide comprehensively the above things and decide the optimal treatment plan.