The distribution, number, colour and growth of body hair are the gene expression in humans of one’s hereditary and family axis and are strongly influenced by sex hormones. Epilation has an advantage over depilation as it determines a more prolonged effect in time, as the actual bulb of the hair is destroyed. The cyclical growth of each hair follicle is divided into Anagen, Catagen, and Telogen phases. The laser only affects hairs in the growth phase (anagen), obviously not all hairs are present on the skin at this stage at the same time, so a number of sessions are needed. The number of sessions also varies depending on the area to be treated, the size of the area, the presence of hormonal dysfunction and the use of certain medications.
Laser sources for hair removal
They target the melanin in the pilaris structure. The results obtained using this methodology were extremely variable as regards both duration and quality, according to the sources used. This is because of the broad spectrum of light absorption of melanin. This has resulted in the production of a large variety of laser sources more or less effective for this purpose. Permanent hair removal requires a selective destruction of both the bulb and its vascular papilla. Since these structures are located deep down in the skin (1-1.5 mm deep) the suitable laser sources are those that emit IR, such as: Diodes (800 nm), Alexandrite (750 nm) and Nd-YAG laser (1064 nm).
What factors affect depilation?
- The hair growth phases
- The colour of the hairs
- The different depth of the follicles
- Previously treated hairs
- The area of the body to be treated
How long does a session last?
A laser light treatment can last from a few minutes to over an hour, depending on the size of the area to be treated.
How many sessions are needed?
Since the laser works effectively on hair bulbs in the active growth phase (pro-anagen and anagen), more than one treatment is needed to neutralise the bulbs that have not reached this stage yet.
Before a laser session
It is recommended not to undergo long sun lamp or sunbathing sessions.
What does the treatment consist of?
The beam of laser light is applied through a cool tip wand that allows you to direct the laser energy straight onto the hair root, protecting and cooling the surrounding skin, hence minimising any discomfort.
After the treatment
After the treatment, there may be a slight reddening and/or swelling of the treated area that both disappear within a few hours.
What are the limits of laser depilation?
It is not very effective on grey hair and low pigmented short fine hair.