Page 141 - Chapter 3 - Laser/IPL Hair Removal

Chapter 3 – Fundamentals of Laser/IPL Hair Removal 2nd Edition
Figure 81 - You may like being in the ‘safe zone’, but your success rate will be fairly low...
But, higher fluences will also increase temperature elsewhere, especially in the epidermal melanin. This will induce more blistering, hyper- and hypo-pigmentary changes and pain, and so, poses a greater risk of unwanted damage. Hence, more cooling MUST be applied when using higher fluences, on all skin tones.
However, if sufficient pre-cooling is applied, at the right temperature, then the treatments should be much more comfortable and safer.
In fact, it is advisable to ‘over-cool’ – it is better to cool too much rather than too little. Just be careful not to induce ice-burns.
________________________________________________________________________ 141 Chapter 3, Ed. 2.0 Laser/IPL Hair Removal
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Likewise, darker skin tones require more cooling again. So, the amount of pre-cooling, using ice packs, is determine by the skin colour and the fluence applied.
If too high a fluence is used on any particular skin tone, without the ‘corresponding’ amount of pre-cooling, then it is likely pain and unwanted skin damage will occur.