Skin Darkening from Laser Hair Removal

Without getting a burn or blister, it is possible that any trauma, including friction from rubbing your skin hard with a towel, can induce darkening (postinflammatory hyperpigmentation). This is usually temporary but can take many months to go away.  Prescription lightening creams and religious application of daily sunscreen is important.

It is certainly possible to have darkening of the skin in the treated area after laser hair removal.  In darker skin types this type of darkening (postinflammatory hyperpigmentation) can arise after any trauma to the skin (e.g. acne, mild burns).  If the laser caused this, then typically the pattern of darkening looks like the pattern of the laser application (circles or rectangles etc depending on the laser)...

I'd show your doctor to see about the diagnosis and also about getting bleaching creams to speed up the resolution of this which can take months.  Most docs will prescribe something containing hydroquinone cream.  Careful sun protection is very helpful.

You may be experiencing post inflammatory hyperpigmentation from the laser treatments.

I recommend that you return to your treating physician and discuss the possible use of a prescription strength bleaching cream containing 4% hydroquinone.