Hair removal

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📅 22 de noviembre de 2024 ✍️ By Brett Griffin ⏱️ 6 Mins Read 🗂️ Blog 🕒 Last updated: 23 de noviembre de 2024

Hair removal, also known as epilation or depilation, is the deliberate removal of body hair.

Hair typically grows all over the human body. Hair can become more visible during and after puberty and men tend to have thicker, more visible body hair than women.^[1] Both men and women have visible hair on the head, eyebrows, eyelashes, armpits, pubic region, arms, and legs; men also have thicker hair on their face, abdomen, back and chest. Hair does not generally grow on the lips, the underside of the hands or feet or on certain areas of the genitalia.

Forms of hair removal are practiced for various and mostly cultural, sexual, medical or religious reasons. Forms of hair removal have been practiced in almost all human cultures since at least the Neolithic era. The methods used to remove hair have varied in different times and regions, but shaving is the most common method.^{[Citation needed]}

1 Forms of hair removal
2 Hair removal methods
- 2.1 Permanent hair removal
- 2.2 Permanent hair reduction
3 Clinical comparisons of effectiveness
- 3.1 Experimental or banned methods
- 3.2 Doubtful methods
4 Advantages and disadvantages
5 Footnotes
6 Further reading
7 External links

Forms of hair removal

Depilation is the removal of the part of the hair above the surface of the skin. The most common form of depilation is shaving or trimming. Another option is the use of chemical depilatories, which work by breaking the disulfide bonds that link the protein chains that give hair its strength.

Epilation is the removal of the entire hair, including the part below the skin. Methods include waxing, sugaring, epilation devices, lasers, threading, intense pulsed light or electrology. Hair is also sometimes removed by plucking with tweezers.

Hair removal methods

Many productsMany other products

Temporary removal of hair to the level of the skin lasts several hours to several days and can be achieved by

Shaving or trimming (manually or with electric shavers)
Depilatories (creams or "shaving powders" which chemically dissolve hair)
Friction (rough surfaces used to buff away hair)

"Epilation", or removal of the entire hair from the root, lasts several days to several weeks and may be achieved by

Tweezing (hairs are tweezed, or pulled out, with tweezers or with fingers)
Waxing (a hot or cold layer is applied and then removed with porous strips)
Sugaring (hair is removed by applying a sticky paste to the skin in the direction of hair growth and then peeling off with a porous strip)
Threading (also called fatlah or khite in Arabic, or band in Persian) in which a twisted thread catches hairs as it is rolled across the skin
Epilators (mechanical devices that rapidly grasp hairs and pull them out).
Powder (weakens the root ends of hair and halts hair production).
Use of thanaka powder along with kusuma oil.
Drugs that directly attack hair growth or inhibit the development of new hair cells. Hair growth will become less and less until it finally stops; normal depilation/epilation will be performed until that time. Hair growth will return to normal if use of product is discontinued.^[2] Products include the following:
- The pharmaceutical drug Vaniqa, with the active ingredient eflornithine hydrochloride, inhibits the enzyme ornithine decarboxylase, preventing new hair cells from producing putrescine for stabilizing their DNA.
- Antiandrogens, including spironolactone, cyproterone acetate, flutamide, bicalutamide, and finasteride, can be used to reduce or eliminate unwanted body hair, such as in the treatment of hirsutism.^[3]^[4]^[5]^[6] Although effective for reducing body hair, antiandrogens have little effect on facial hair.^[7] However, slight effectiveness may be observed, such as some reduction in density/coverage and slower growth.^[8] Antiandrogens will also prevent further development of facial hair, despite only minimally affecting that which is already there. With the exception of 5α-reductase inhibitors such as finasteride and dutasteride,^[3]^[9] antiandrogens are contraindicated in men due to the risk of feminizing side effects such as gynecomastia as well as other adverse reactions (e.g., infertility), and are generally only used in women for cosmetic/hair-reduction purposes.^[10]

Permanent hair removal

For over 130 years, electrology has been in use in the United States. It is approved by the FDA. This technique permanently destroys germ cells[11] responsible for hair growth by way of insertion of a fine probe in the hair follicle and the application of a current adjusted to each hair type and treatment area. Electrology is the only permanent hair removal method recognized by the FDA.[12]

Permanent hair reduction

Laser hair removal (lasers and laser diodes): Laser hair removal technology became widespread in the US and many other countries from the 1990s onwards. It has been approved in the United States by the FDA since 1997. With this technology, light is directed at the hair and is absorbed by dark pigment, resulting in the destruction of the hair follicle. This painless laser hair removal^[13] method sometimes becomes permanent after several sessions. The number of sessions needed depends upon the amount and type of hair being removed. Equipment for performing laser hair removal at home has become available in recent years.
Intense pulsed light (IPL)
Diode epilation (high energy LEDs but not laser diodes)

Clinical comparisons of effectiveness

A 2006 review article in the journal "Lasers in Medical Science" compared intense pulsed light (IPL) and both alexandrite and diode lasers. The review found no statistical difference in effectiveness, but a higher incidence of side effects with diode laser based treatment. Hair reduction after 6 months was reported as 68.75% for alexandrite lasers, 71.71% for diode lasers, and 66.96% for IPL. Side effects were reported as 9.5% for alexandrite lasers, 28.9% for diode lasers, and 15.3% for IPL. All side effects were found to be temporary and even pigmentation changes returned to normal within 6 months.[14]

Experimental or banned methods

Photodynamic therapy for hair removal (experimental)
X-ray hair removal is an efficient, and usually permanent, hair removal method, but also causes severe health problems, occasional disfigurement, and even death.^[15] It is illegal in the United States.

Doubtful methods

Many methodspublished clinical proof

Electric tweezers
Transdermal electrolysis
Transcutaneous hair removal
Photoepilators
Microwave Hair Removal
Foods and Dietary supplements
non-prescription topical preparations (also called "hair inhibitors", "hair retardants", or "hair growth inhibitors")

Advantages and disadvantages

There are several disadvantages to many of these hair removal methods.

Hair removal can cause some issues: skin inflammation, minor burns, lesions, scarring, ingrown hairs, bumps, and infected hair follicles.

Some removal methods are not permanent, can cause medical problems and permanent damage, or have very high costs. Some of these methods are still in the testing phase and have not been clinically proven.

One issue that can be considered an advantage or a disadvantage depending upon an individual's viewpoint, is that removing hair has the effect of removing information about the individual's hair growth patterns due to genetic predisposition, illness, androgen levels (such as from pubertal hormonal imbalances or drug side effects), and/or gender status.

Another disadvantage of permanent (laser, electrolysis) hair removal is a decrease in regeneration ability of human skin, since hair follicles contain stem cells which help with healing.^[16]

Footnotes

External links

Laser Facts (US Food and Drug Administration)
American Academy of Dermatology, Public Resource Center, Laser Hair Removal
American Society for Dermatologic Surgery: search for: "Laser Hair Removal Fact Sheet"

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