Disorders of increased melanin pigmentation that develop without preceding inflammatory disease.

Some women notice other skin changes during pregnancy. For many women, the nipples become darker and browner during pregnancy. Many pregnant women also develop a dark line (called the linea nigra) on the skin that runs from the belly button down to the pubic hairline. Patches of darker skin usually over the cheeks, forehead, nose, or upper lip also are common. Patches often match on both sides of the face. These spots are called melasma or chloasma and are more common in darker-skinned women.

What might help:

• Be patient — stretch marks and other changes usually fade after delivery.

Consumers need to beware of products to lighten or whiten their complexion. These products, which include both injectable skin whitening and skin bleaching products, are potentially unsafe and ineffective, and might contain unknown harmful ingredients or contaminants.

Injectable skin whitening products are marketed for injection into a vein or muscle or under the skin. They are sold online and in some retail outlets and health spas. They often promise to lighten the skin, correct uneven skin tone, and reduce blemishes. Some products even claim to treat conditions such as liver disorders and Parkinson’s disease.

Although the average consumer might not assume so, these products are unapproved new drugs whose sales are not condoned by the U.S. Food and Drug Administration (FDA). The FDA has not approved any injectable drugs for skin whitening or lightening.

“These products pose a potentially significant safety risk to consumers. You’re essentially injecting an unknown substance into your body—you don’t know what it contains or how it was made,” says In Kim, a pharmacist at the FDA.

Beyond the potential harm from the product itself, improper or unsafe injection practices may transmit disease, cause infection, and result in serious injury.

On September 25, 2017, a federal judge ordered the New Jersey company, Flawless Beauty LLC, to halt sales and recall some of its products because they are unapproved new drugs that may be unsafe, putting consumers at risk. Flawless sold skin whitening and other products under the Relumins, Tatiomax, TP Drug Laboratories, Laennec, Saluta, Tationil, and Laroscorbine brands, among others.

“We have noticed a number of companies marketing injectable products for skin whitening online and are concerned that these products and their ingredients may cause serious harm to consumers,” Kim says.

The products sold by Flawless contain ingredients, including glutathione, vitamin C, collagen and even human placenta.

“In general, consumers should be cautious of any products marketed online with unproven claims about their safety and effectiveness,” Kim says. “Consumers also should consult with their health care practitioner before deciding to use any new drug product.”

What You Should Do

If you have used any injectable products for skin lightening or whitening and are experiencing side effects, consult a doctor as soon as possible. You or your doctor can also report an illness or injury you believe to be related to the use of these products by calling 1-800-FDA-1088.

If you have questions about particular skin conditions, consult a health care professional. There are FDA-approved topical drug products to treat certain skin conditions, for example, hyperpigmentation (which causes the skin to darken) and melasma (which causes patches on the face).

Unlike the unapproved injectable skin whitening drug products, FDA-approved drugs have been determined by FDA to be safe and effective for their intended use. In addition, facilities where the approved products are made are generally subject to FDA inspection and must comply with FDA regulations and good manufacturing practices.

Introduction

Melasma is a common skin problem caused by brown to gray-brown patches on the face. Most people get it on their cheeks, chin, nose bridge, forehead, and above the upper lip. It is more common in women than men. Pregnancy is a common cause of melasma. It also affects woman taking oral contraceptives and hormones.

Etiology

Etiologic factors include genetic influences, ultraviolet (UV) radiation, pregnancy, hormonal therapies, cosmetics, phototoxic drugs, and antiseizure medications.

Melasma stimulates melanocytes by the female sex hormones estrogen and progesterone, producing more melanin pigments when the skin is exposed to the sun.

Genetic

Genetic predisposition may be a major factor in the development of melasma.

• Melasma is more common in females than in males.

• Persons with light-brown skin types from regions of the world with high sun exposure are more prone to the development of melasma.

• Approximately 50% report a positive family history of the condition. Identical twins have been reported to develop melasma.

Sunlight Exposure

UV radiation can cause lipids peroxidation in cellular membranes, resulting in free radicals which could stimulate melanocytes to produce excess melanin.

• Sunscreens that block UV-B radiation (290-320 nm) do not block the longer wavelengths of UV-A and visible radiation (320-700 nm) which also stimulate melanocytes to produce melanin.

Hormonal Influences

Hormones may play a role in developing melasma in some individuals.

• The mask of pregnancy is known to occur in obstetric patients. The exact mechanism is unknown. Estrogen, progesterone, and melanocyte-stimulating hormone levels are normally increased during the third trimester of pregnancy and may be a factor.

• Patients with melasma who are nulliparous have no increased levels of estrogen or MSH but show elevated levels of estrogen receptors within the lesions. In addition, melasma with estrogen- and progesterone-containing oral contraceptive pills and diethylstilbestrol treatment for prostate cancer have been observed.

• A woman who is postmenopausal and given progesterone may develop melasma, while those who are given estrogen alone do not; this implicates progesterone as playing a primary role in the development of melasma.

Thyroid Disease

There is a four-fold increase in thyroid disease in melasma patients.

• There is an association between the development of melasma and the presence of melanocytic nevi and lentiginous nevi.

• This would indicate a relationship between the development of melasma and the presence of pigmentation.

Epidemiology

Persons of any race can be affected. Melasma is more common in darker skin types than in lighter skin types, and it is particularly more common in light brown skin types. Women are affected nine times more than men. Melasma is rare before puberty and more common in reproductive years. Melasma is present in 15% to 50% of pregnant patients. The prevalence varies between 1.5% and 33% depending on the population.

Pathophysiology

The most important factor is exposure to sunlight. UV radiation induces production of alpha-melanocyte–stimulating hormone and corticotropin as well as interleukin 1 and endothelin 1, which contributes to increased melanin production by intraepidermal melanocytes. Prolonged UV exposure-induced dermal inflammation and fibroblast activation upregulate stem cell factors in the melasma dermis, resulting in increased melanogenesis.

Histopathology

Melanin is increased in the dermis or epidermis or both. Epidermal melanin is located in the keratinocytes in the basal and suprabasal areas. Dermal melanin also is found in the superficial and mid dermis within the macrophages congregating around small, dilated vessels. Inflammation is sparse or absent.

History and Physical

Melasma occurs in sun-exposed areas as an acquired hypermelanosis, presenting as symmetrically distributed hyperpigmented macules which can be confluent or punctate. It is worse in areas that receive excessive sun exposure, including the cheeks, the upper lip, the chin, and the forehead.

Evaluation

No laboratory tests are indicated although some studies suggest mild abnormalities in thyroid function are associated, specifically pregnancy- or oral contraceptive pill-associated melasma. In these cases, it is reasonable to consider checking thyroid function tests. Wood lamp examination helps to localize the pigment to the dermis or epidermis.

Treatment / Management

The best treatment is a topical combination of hydroquinone cream and avoidance of sun or estrogen exposure. In addition to the avoidance of sun exposure, discontinuing the use of high-SPF sunscreens (50 or higher) can prevent the development of melasma. First-line therapy for melasma consists of effective topical therapies, mainly in the form of triple combinations (hydroquinone 4%, tretinoin 0.05%, and fluocinolone acetonide 0.01%) and when triple combinations are unavailable or when patients have hypersensitivity to them, then dual ingredients or single agents be considered.

Chemical peels and lasers may yield unpredictable results and are associated with adverse effects including epidermal necrosis, postinflammatory hyperpigmentation, and hypertrophic scars. These interventions are second-line therapies and used only if the topical medication has failed. In experienced hands, chemical peels and lasers are usually safe and may produce results faster than topical medications.

Skin Peels These procedures carry a risk of adverse outcomes. Peels use glycolic or salicylic acid-based compounds which may increase turnover of hyperpigmented keratinocytes.

• They often begin as a monthly treatment using low concentration formulas and progress to weekly applications at higher concentrations.

• Lightening agents are usually used in conjunction with superficial peels for better results.

• Skin peels should only be used after a trial of therapy with at least one skin-lightening agent.

• Close monitoring of skin depigmentation is necessary, and therapy should be halted if alterations in pigmentation in the surrounding skin are noted.

Lasers

The efficacy of lasers for the treatment of melasma has been associated with undesired cosmetic results. Their use should be considered in cases of extensive disease that is refractory to laser use as it may actually worsen the condition.

Differential Diagnosis

The differential diagnoses include:

• Actinic Lichen Planus

• Acanthosis Nigricans

• Discoid Lupus Erythematosus

• Drug-Induced Photosensitivity

• Exogenous Ochronosis

• Frictional Melanosis

• Mastocytosis

• Nevi of ito and Ota

• Pigmented Contact Dermatitis

• Poikiloderma of Civatte

• Postinflammatory Hyperpigmentation

Prognosis

Melasma has no associated mortality or morbidity. No cases of malignant transformation or association with the increased risk of melanoma or other malignancies have been reported. Patients with melasma actually are considered to have less risk for melanoma.

The dermal pigment may take longer to resolve than the epidermal pigment because no effective therapy is capable of removing dermal pigment. However, treatment should not be withheld simply because of a preponderance of dermal pigment. The source of the dermal pigment is the epidermis, and, if epidermal melanogenesis can be inhibited for long periods, the dermal pigment will not replenish and will slowly resolve.

Resistant cases or recurrences of melasma occur often and are certain if strict avoidance of sunlight is not rigidly heeded.

Pearls and Other Issues

Patients should avoid the routine use of cosmetics on sensitive skin. Vigorously rubbing triple creams on hyperpigmented areas may worsen the situation. Ochronosis can occur with prolonged exposure to creams with potent steroids.

Melasma should be distinguished from post-inflammatory hyperpigmentation, actinic lichen planus, and hydroquinone-induced exogenous ochronosis.

Patient education should include strict sun avoidance as this is essential for resolution and may prevent recurrence of melasma. Melasma patients should apply bleaching creams to dark areas only. Resolution with strict sun avoidance and topical bleaching creams can take many months; patients should be educated to expect slow but gradual lightening.

Enhancing Healthcare Team Outcomes

Melasma is a benign skin disorder that has no morbidity. The key reason why some patients seek treatment is aesthetic. Fortunately, melasma resolves on its own in most cases. Thus, healthcare workers including nurse practitioners, dermatologists, and primary care providers should educate the patient on avoiding the sun and discontinuing the trigger medications. There are dozens of treatments for melasma and none is superior to the other. In fact, some treatments like the laser may worsen the condition.

Patients who seek no treatment and avoid the sun will notice that the rash usually disappears in a few months.