I just finished my second of 6 treatmesnt of laser hair removal around my areolas. My treatments have been going well and the darker and courser hairs have been falling out right after treatment. However, I noticed after the second, the lighter and less course hairs did not fall out. I am wondering if that means those hairs are not effected by the laser? Course and dark hairs very near them fell out, so would the laser have gotten those hairs too? Is there an amount of area that each zap covers?