Selective Photothermolysis – an in-depth explanation

Back in 2016 (I think) I gave a talk to the American Society of Lasers Surgery and Medicine about the theory of Selective Photothermolysis. This is the theory which underpins all of today’s photothermal laser/IPL treatments. In this talk I discuss the idea behind thermal relaxation time and how it ‘fits’ with treatments. In fact,… Continue reading Selective Photothermolysis – an in-depth explanation

Laser/IPL Hair Removal – How many follicles do we kill each treatment?

All hair follicles grow according to a cycle – ‘anagen, catagen, telogen’. The follicle germative cells promote anagen hair growth at consistently regular intervals resulting in periods of active growth, followed by inactivity. The duration of these periods depends on the which part of the body is being considered. I created a computer model to… Continue reading Laser/IPL Hair Removal – How many follicles do we kill each treatment?

More on the ‘best’ intervals between laser/IPL hair removal sessions…

Choosing the ‘best’ time between laser/IPL hair removal sessions is not simple. It depends on the hair growth cycles of the hairs we are targeting, which is not the same across the body. That means that we need to consider the body area when deciding how long to leave between sessions. We can only target… Continue reading More on the ‘best’ intervals between laser/IPL hair removal sessions…

Light penetration into skin and the subsequent temperature rise

Where does light go when it enters the skin? Well, it’s actually quite complicated! Some of it reflects off the skin surface, some is absorbed in the melanin (basal layer), some penetrates through to the fatty tissue, while some is turned around and escapes back into the air. The follow slideshow gives a simple explanation… Continue reading Light penetration into skin and the subsequent temperature rise