Page 157 - Chapter 3 - Laser/IPL Hair Removal

Exogen Phase
Chapter 3 – Fundamentals of Laser/IPL Hair Removal 2nd Edition
This phase typically lasts between 10 and 14 days, in most people.
Telogen Phase
This is known as the quiescent or resting phase, when the follicle remains inactive or dormant until stimulated into the anagen stage where the whole process is repeated.
The telogen phase is really quite boring! It is when the follicle ‘rests’ – it doesn’t really do anything interesting at all. It is the gap between catagen and the next anagen phase.
Telogen only lasts for a few weeks, with the club hair often being retained within the follicle until the new hair is produced and pushes the club hair out of the follicle. The telogen follicle is one-third to half the length of the full anagen follicle.
The telogen phase lasts between around 10 and 20 weeks, typically. During this phase the hair becomes a club hair.
Figure 89 - The telogen follicle – the ‘permanent’ part of the HF
During this phase the hair shed – This is thought to be an active process and, hence, it is quite independent of both the telogen and anagen phases.
Summary - the hair is a keratinised structure consisting of a number of layers. The follicle forms part of the pilo-sebaceous unit which reaches from the epidermis down to the dermal papillae situated in the dermis.
The follicle goes through a growth cycle divided into three main stages, these being :
Anagen - active growing phase – weeks to years Catagen - transitional phase – up to 4 weeks Telogen - resting phase – 10 to 20 weeks
________________________________________________________________________ 157 Chapter 3, Ed. 2.0 Laser/IPL Hair Removal
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