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What Are Depigmenting Agents and How Do They Work?
Topical lightening medications known as depigmenting agents are used to treat hyperpigmentation and melasma, which are conditions that result in dark, discolored spots on the skin. It is also used to treat vitiligo, freckles, and post-inflammatory hyperpigmentation.
The amount of melanin, a natural skin pigment produced by certain skin cells called "melanocytes," that is present in the body determines the color of the skin, hair, and eyes. Although the number of melanocytes in each individual is the same, the amounts of melanin that these cells generate vary. The skin appears lighter when melanin production is lower and darker when melanin production is higher. Genes determine how much melanin is produced in the body.
Depigmenting drugs impact melanogenesis, or the synthesis of melanin, by preventing tyrosinase synthesis. The initial stage of melanin synthesis is carried out by the enzyme tyrosinase, which is only produced by melanocyte cells. It converts tyrosine, an amino acid used to make protein, to dopaquinone. Subsequently, dopaquinone is transformed into melanin within the body through a sequence of additional chemical processes.
Some lotions and gels can be used as depigmenting agents. Although complete depigmentation of a specific spot may take up to 12 months, depigmentation is often completed after one to four months. Using sunscreen during the day helps the depigmenting chemicals work more effectively.
What Are the Types of Skin Pigmentation?
Skin pigmentation can occur due to genetic, external climate change, internal hormonal changes, and autoimmune conditions; some conditions are freckles, the most common type of pigmentation. These tiny dots are often the first signs of sun damage. In addition, genetic influence can affect freckles. These dots are commonly seen on the patient's skin. During the summer season, they are darker on the patient's skin.
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Melasma is seen on the face as big tan or brown patches with an indistinct border. It is mainly found on female skin; the cause is primarily unknown. However, it is frequently triggered by hormonal changes, and the situation can worsen by exposure to sunlight. Therefore, a better patient should cover the face with something during the daytime.
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Solar lentigines, the pigmentation kind, are also known as liver spots, sun spots, brown spots, or age spots to solar lentigines. They can be seen anywhere on the body and mostly happen due to UV rays from sun exposure. These pigmented spots differ in color from light brown to black. This kind of pigmentation must be under observation to convert into skin cancer and melanoma. They have the potential to develop cancer and melanoma.
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Vitiligo, this depigmentation, can be seen first on the face rather than other body parts. If a patient has a condition like light patches or spots on the skin of the face, this can be called vitiligo. This condition can also be seen on other parts of the body; those body parts most exposed repeatedly to the sunlight, like hands and feet, it is seen as pigmentation on one or both sides of one’s face. Few treatments may help to decrease or contain depigmentation. Other treatments can help merge the lightened areas with one's natural skin color. Depigmentation can be uniform on the face and body. This is the most common type of vitiligo.
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Face vitiligo can develop on the skin, lips, and also inside the mouth. It happens when some of the patient's skin cells stop producing melanin. Melanin gives color to the skin. A shortage of melanin results in white or light patches on the face skin surface, hair can get too soon gray or white, including the patient's beard, eyelashes, and eyebrows, and there are chances of change in the color of the retina in the eye.
What Is the Treatment for Depigmentation?
Recently, many types of depigmenting agents have been available in the market in topical creams and gels. This is because so many studies show that depigmenting agents are safe and effective. The most common depigmenting agents are hydroquinone, monobenzylether of hydroquinone, gentisic acid, licorice, arbutin, retinoids, niacinamide, kojic acid, mequinol, azelaic acid, corticosteroids, hydroxystilbene, glutathione, alosein, glycolic acid, n-acetyl glucosamine, and melatonin.
A variety of treatments are available for depigmentation and also give good results.
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Chemical peels help remove the brown spot by using alpha hydroxy acid or beta-hydroxy acid. At least four to five sittings need to remove the dark spots.
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Microdermabrasion microcrystals are sprayed on the dark spot to peel off the uppermost skin layer. This treatment takes 25 to 30 minutes; after this treatment, the patient can do routine daily work.
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The depigmentation laser in this treatment process needs to be done correctly; otherwise, it can damage the skin if not done correctly. Lasers are light-emitting instruments that provide a single and particular wavelength of light for specific skin issues. For example, some lasers can remove brown spots, and these devices help break the dense melanin pigment, which causes discolorations.
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The use of topical creams is also beneficial; creams and gels with a combination of various drugs have been shown to have beneficial effects, and creams add glutathione, arbutin, kojic acid, and hydroquinone. In addition, skin-lightening products added glutathione, arbutin, kojic acid, and hydroquinone reduce pigmentation and blemishes, lighten discoloration, and proper skin tone.
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Arbutin acts as an inhibitor of tyrosinase; absorption into the skin helps release hydroquinone. Hydroquinone successfully reduces melanin in the skin. In addition, it decreases skin issues like aging spots and sun damage.
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Kojic acid reduces the overproduction of melanin pigment in localized areas.
What Are the Side Effects of Depigmenting Agents?
The depigmenting agents are primarily composed of acids and can irritate the skin and cause burning, itching, and pulling sensations. They can cause an allergic reaction leading to redness or sometimes blisters, loss of skin color in a localized area, or inflammation of the skin leading to localized dermatitis, dry, scaly skin; it can cause blue-black pigmentation of the skin, and fingernail staining due to application with fingertips.
Depigmentation therapy should not be used in children less than 12 years of age. A healthcare provider must first discuss several aspects of this treatment, like the cost, treatment duration, steps, issues related to depigmentation at particular body sites, and stress on the expected permanency of depigmentation and side effects. The more crucial stage of depigmentation therapy is to select a proper vitiligo patient.
Conclusion:
Depigmenting agents can help remove or fade the hyperpigmented skin, but healthcare providers need to make one acknowledge the possible outcomes depigmentation may have, mainly in those with dark skin; the results of this treatment are mostly irreversible.
