How IPL Machines Work
IPL machines work best at removing hair when the hair is in a phase of active growth.
It removes hair by sending out high-energy light pulses. There are actually two beams of light, one red and the other yellow which acting together result in both the existing hair and the follicles where the hair grows.
However not all hair in the area of treatment will be in this phase at any point in time. It is therefore best to spread IPL treatments out over several weeks.
This is to make sure that hair which isn’t treated in one session is affected in the next. The way hair grows can be different for each individual, so its best to adjust the treatment to suit each person's needs.