Hair removal methods
Typically, according to evolution, hair grows only in some regions of the body: the scalp, eyebrows, eyelids, chin, armpits, pubic and lower legs, forearms (for both sexes); chest, back (for men); however, for many reasons, it may be due to genes, hormones, certain congenital diseases or the result of corticosteroid use, so hair may grow thicker, darker, stiffer or appear in unusual locations. Stemming from customs, cultural traditions, religion, aesthetics, hygiene, the removal of excessively thick hairs, in unwanted skin areas is the need and concern of many people, especially women.
To have the right hair removal method, people need an understanding of hair formation and development is required.
The hair is formed from a hair-glandular unit, usually located in the deep layer of the dermis. In each of these hair-follicle units, there is a hair follicle along with hair follicles, sebaceous glands, and hair building muscle. The follicle is where the germ cells differentiate into keratinocytes, along with the pigment cells, to create hairs of different colors and sizes. The formation, development, and degeneration of the hair take place in a cycle through three stages (called the three states of hair).
The state of active hair (anagen) is the period of hair growth, existing on the skin surface. A state of regressed hair (catagen) is a period of hair degeneration, permanent loss from the skin; and finally resting – undeveloped state (telogen).
Depending on the genetic characteristics, development stage of the body (hormone) and the impact of external factors, each skin area on the body has a distribution of the percentage of hairs that exist in each state, is different. The hair in the active state is usually much easier to remove than the hair in the resting state.
There are many methods to remove unwanted hair on the body. It can be divided into two groups of ways, including temporary hair removal methods and permanent hair removal methods:
Methods of temporary hair removal.
1. Hair removal method
This is not a hair removal but just a method of using chemicals to reduce or discolor the hair, thereby making the hair no longer visible on the skin. This method, if possible, only applies to areas of skin that are black but small and sparse; However, this method is probably only of historical significance.
2. Removal method for hair removal
This is the most common and simple way to remove the hair from the surface of the skin temporarily. Although the method of shaving to remove the hair has been confirmed not to make the hair harder, blacker or regrow faster, making hairs more prominent on the skin. Besides, with some skin areas such as armpits, groin, shaving with a regular knife, can cause skin damage accompanied by the risk of infection, hyperpigmentation on the spot.
3. Hair removal method
Hair removal is a simple, accessible, inexpensive method, and after any regrowth, there is no change in color, hardness, or density (thickness). The advantage of epilation is that the hair grows back more slowly because the hair follicle is damaged after plucking and takes time to regenerate; On the other hand, there is a certain percentage of damaged hair follicles that do not recover and the hair may not grow back. The downside of this practice is that it causes pain and carries the risk of inflammation of the hair follicles.
4. Waxing method
The method is relatively simple, allowing the removal of a large number of feathers at once. With this method, the hair is also plucked out of the hair follicle. Wax for hair removal is usually made from natural products (beeswax, vegetable acid, talc, sugar, etc.), so it is less likely to cause skin irritation. Apply as a topical cream (EMLA 5%) or a 20% lidocaine aerosol, note the temperature of the wax when applied to the skin to avoid scalding the skin.
5. Sugar use method (sugar waxing)
Using sugar is also a common way to remove hair. This is the same as the wax method instead of just using molten beeswax by using molten sugar in the form of malt, to plaster on the skin to be removed, then the hair is also pulled, directly out of hair follicles.
6. Hair removal by depilatories.
This is a method of using a chemical mixture including thioglycolate combined with sodium hydroxide or calcium hydroxide, which can disrupt the disulfide bond.
When the connection between skin cells as well as horny cells is broken, the hairs are easily broken and shed from the skin surface. This is also a simple method to remove hair temporarily, but the disadvantage of this method is that it often irritates the skin due to the direct impact of chemicals on local skin cells.
Methods for permanent hair removal
1. Electrolysis method
A method that uses a tiny electrode to plug into the hair follicle and then inject an electric current to burn and destroy the hair follicle, causing the hair to not continue to be generated. This procedure requires the destruction of individual hair follicles, so it takes a lot of time to remove a wide area of hair such as the legs, forearms or chest, back. Although the method of permanent hair removal is how Doing this also has many disadvantages, such as Difficulties during the implementation of the technique, takes a lot of time, leaving many risks for the skin.
2. Hair removal by laser technology
– Laser, light hair removal mechanism: Based on the selective-photothermolysis principle, the energy of the laser and light are strongly absorbed by melanin (which is inherent and concentrated with the density).
This process destroys melanocyte and produces heat that destroys the germ cells of the hair follicle, causing the hair follicle to be damaged or weakened, to no longer or reduce its ability to produce fibers hair. On the other hand, in addition to the target is melanin, laser and light energy also have a selective effect on hemoglobin and oxyhemoglobin (the components that make up the red color of blood). This can clog small blood vessels to nourish the hair follicles, contributing to increased damage to the hair follicles.
– Types of lasers and light for hair removal:
+ Laser hair removal: the absorption of energy from the light of melanin is in the visible and near-infrared spectra, so the light band has a wavelength from about 500 to about 1200 nm, often chosen to create Laser type highly effective in hair removal. In addition to the necessary conditions of the appropriate wavelength, the laser device must have a suitable pulse width (the time the laser is emitted and impact on the target tissue), ensuring the target tissue absorbs high energy. Best.
+ IPL (intense pulse light): the device emits a high-intensity light beam, with a wavelength range of 610nm to 1200nm, the pulse duration can vary from 0.1-1ms. Also can combine IPL with RF (radio frequency) to increase the effectiveness of treatment.
-Laser or IPL hair removal procedure: the treatment usually lasts from 1 to 7 times, 2-3 weeks apart, the skin is shaved immediately before treatment and cooled immediately after treatment with a towel or cold compresses to reduce heat damage or local irritation.
3. Hair removal with Vaniqa cream
Vaniqa is a pharmaceutical product, formulated as a topical cream. Vaniqa has a permanent hair elimination effect through the mechanism of inhibiting enzymes necessary for cell multiplication as well as maintaining a number of other cellular functions – helping to normal hair growth, thereby making hairs do not grow further, degenerate and shed.