I had my first underarm and bikini laser (GentleLase) treatment late November. It worked really well: hair shedded and I 'm still (almost) hair free. The only thing that concerns me a little bit is a discolouration of my skin only on one side of the bikini. I can’t understand why this happened only on a small part of the treated area.

Discoloration in what way? Hyperpigmentation? Sometimes those bikini areas can be darker than surrounding skin, but if you haven’t noticed anything like it before, and it’s only one side, and it hasn’t faded at all, that is odd. Something you should mention to your laser practitioner, definitely. Discoloration is a side effect of laser sometimes…

Address this with your clinic. They may need to decrease the settings just slightly. Pigment can be a bit different on variout bikini areas.