Laser hair removal works by targeting the pigment in the hair. If the hair is white, blonde or silver it will not work. Your only option for permanent removal is electrolysis.
I am not familiar with that laser. We use our Sciton 1064 Laser for hair reduction in darker skin individuals. It has not given us any hyper pigmentation problems. Perhaps you should seek out a Sciton owner in your locale for further treatments. We use Hydroquinone...
Laser hair removal will only reduce the hair. Dark bumps can be improved with a combination of lasers, Aerolase, microneedling/prp, skin lightening, peels, and skin care. Sun protection is essential. I recommend getting a formal evaluation with an expert. Best, Dr. Emer