any tell tale signs to tell if thermolysis working?

I have just started thermolysis sessions on some chest and back hair to finish off a series of ipl treatments. Some areas grew back thicker than others and looked a bit unatural so I am just hoping to thin those areas out a bit so it looks a bit more natural. The technician has been recommended by the place that I had the ipl at and after the first treatment (24hours) there is a bit of swelling and even a couple of white pus spots where the hair has been zapped. During the session it felt like every 5th hair or so pulled a bit as it came out. But on the whole did not really feel the hair come out. I am wondering if there are any signs to show that it is working?