Question: follilce depth and laser treatments on different body parts.

I’ve had 3 IPL treatments on my chest and all of the hairs are much thinner than before.
But around my nippbles and on the sides of my chest muscles the hairs are coarser than the other hairs. Is this becuase the follicles are deeper into the skin in these areas?

I have noticed, that some areas of the body have a different response than others. Around the nipples, for example, gets a high rate of regrowth 2-3 months after treatment. Probably, the IPL is not as effective in these areas.