Exactly as Ms Padma the Gorgeous said. You will need several sessions to go through the growth recycles. You may well be seeing follicles that have not started to produce their hair as yet, after you zap them it will take six weeks for the next buggers to grow.
One of the only useful things from my B,Sc, which I got when Einstein was a kid

, was I did a project on hair growth in rats. So I understood what the techs were saying, a little bit more than they knew in fact

. Hair growth is ruled by very strict hormonal cycles all over your body, and it varies in different areas of your body. Tummy hair and back hair and genital hair and facial hair all grow differently and even have different structures.
Bet you needed to know that

.
Just to bring the whole conversation into the gutter

, the woman who does my waxing was telling me how she had given herself a XXX Brazilian, as she said you practice somewhere. She said how sore she was after and various parts of the area had been waxed in error and were suffering. So she went home and showed her boyfriend, hoping for some sympathy, of course he got so horny he wasn't that interested into the massage the cream into the sore areas for more than a few minutes before urges hit. I wasn't sure if she was sad or happy. Raises a different thread really.
Sorry for the Hijack
Cindy