Peer Reviewed

What's Your Diagnosis?

Hyperpigmented Patches on a Woman’s Sun-Exposed Face: What’s the Cause?

Alexander K.C. Leung, MD, MBBS, FRCPC, FRCP
Benjamin Barankin, MD, FRCPC
Volume 57 - Issue 8 - August 2017

Authors:
Alexander K. C. Leung, MD, and Benjamin Barankin, MD

Citation:
Keung AKC, Barankin B. Hyperpigmented patches on a woman’s sun-exposed face: what’s the cause? Consultant. 2017;57(8):485-489.

 

A 45-year-old woman presented with brownish macules and patches on her face. The pigmentation had developed approximately 10 years ago with the birth of her third child. The lesions had gradually increased in size and number over time. She had taken oral contraceptives for a few years after the birth of her second child. She enjoyed a variety of outdoor activities, and she reported that the pigmentation was more pronounced with sun exposure.

Her past health was unremarkable, and she was not on any topical or oral medications. She denied any history of inflammatory dermatosis prior to the appearance of her skin problem. The family history was not contributory.

Physical examination revealed symmetric, well-circumscribed, brownish macules and patches with irregular borders on the forehead, cheeks, nose, upper lip, and chin. The rest of the physical examination findings were normal.

melasma

 

 

Answer on next page

Answer: Melasma

melasma

A diagnosis of melasma was made. Wood lamp examination showed accentuation of pigmentation suggestive of epidermal pigmentation. The patient was treated with a series of trichloroacetic acid chemical peels, as well as a topical azelaic acid and a retinoid-hydroquinone-steroid (modified Kligman) formulation with significant, albeit incomplete, improvement.

Melasma is an acquired disorder of hypermelanosis characterized by symmetrically distributed hyperpigmented macules/patches involving sun-exposed areas, primarily on the face.1 The term melasma is derived from the Greek word melas, meaning black. Synonyms include chloasma and “mask of pregnancy” when the condition arises during pregnancy.2 The term chloasma is derived from the Greek word chloazein, meaning green.

Epidemiology

Melasma is rarely reported before puberty and is most common in women of reproductive age, especially in their 30s and 40s.3-5 The condition affects all racial groups but is most prevalent in dark-skinned individuals with Fitzpatrick skin types IV to VI, especially Hispanic/Latino, Asian, and African American persons.3-7 The reported prevalence is 4% to 10% among Latina women in the United States.8,9 The prevalence is as high as 40% in Southeast Asian women.9,10 The female-to-male ratio is approximately 9 to 1.6,11

Etiopathogenesis

The pathogenesis is complex and involves the interplay of various factors, the most important one being chronic UV exposure.3,12,13 Other risk factors include genetic predisposition, pregnancy, thyroid dysfunction, use of certain scented cosmetics, oral contraceptive pills, hormonal therapy, photosensitizing agents, and medications (eg, phenytoin, imatinib, amiodarone, tetracyclines).2,4,7,11,14

UV radiation stimulates melanogenesis by direct effects on melanocytes and by indirect effects on keratinocytes releasing melanogenic factors.10,15 It has been shown that UV radiation induces α-melanocyte-stimulating hormone and melanocortin within melanocytes and keratinocytes which help to up-regulate melanocyte proliferation and melanogenesis.1,2,12,15 Lesional melanocytes contain an increased number of melanosomes compared with melanocytes from adjacent normal-looking skin.7 The resultant increase in the number and activity of melanocytes enhances formation and transfer of melanosomes to epidermis and dermis.8 It has also been shown that fibroblasts from melasma lesions secrete more melanogenic cytokines such as nerve growth factor-β than those in normal skin and thus may play a role in melanogenesis and the pathogenesis of melasma.9,16 Overexpression of cadherin 11 (CDH11), stem cell factor, proto-oncogene receptor tyrosine kinase (KIT), and vascular endothelial growth factor in fibroblasts and keratinocytes could induce basement membrane disruption and dermal changes, independent of UV radiation.1,17

Histopathology

Three histologic patterns of pigmentation have been described: epidermal, dermal, and mixed. In the epidermal type (most common), there is an increase of melanin deposits in the basal and suprabasal epidermal layers.8 In the dermal type, many melanin-laden macrophages are seen in the superficial dermis, often surrounding perivascular spaces.8 The mixed type shows a combination of the 2 patterns. Other histologic findings include basement membrane disruption and dermal changes (solar elastosis, increased number and size of blood vessels, and increased number of mast cells).3,17

Clinical Manifestations

Typically, melasma presents with asymptomatic, symmetrically distributed, well-demarcated macules/patches with serrated, irregular, and geographic borders.5,11 The macules/patches usually develop gradually over time. Pigmentation can be guttate, confetti-like, linear, or confluent.5 The color varies from light brown to dark brown to bluish gray.5 Epidermal melasma is usually light brown, and Wood light enhances the color contrast between hyperpigmented areas and normal skin.18 Dermal melasma tends to be bluish or grayish due to the Tyndall effect and exhibits no accentuation of color contrast under Wood light.18 The mixed type is usually dark brown with variable enhancement on Wood light examination.18

Melasma occurs mainly on sun-exposed areas, mostly on the face, less commonly on the forearms, and rarely on the upper chest.1,10,19 Three clinical patterns of pigment distribution are recognized, namely centrofacial (65%), malar (20%), and mandibular (15%).11,12 The centrofacial pattern involves the forehead, cheeks, upper lip, nose, and chin. The malar pattern involves the cheeks and nose.9 The mandibular pattern involves the ramus of the mandible.9

Clinical and Quality of Life Assessment

The Melasma Area and Severity Index (MASI) can be used to assess the severity of the condition and used as an outcome measure for melasma studies.20,21 The MASI score is calculated by subjective assessment of 3 factors—namely, area of involvement, darkness, and homogeneity—with the forehead, right malar region, left malar region, and chin corresponding to 30%, 30%, 30%, and 10% of the total face, respectively.20 The area of involvement in each of these 4 areas is given a numeric value of 0 to 6 (0, no involvement; 1, < 10%; 2, 10% to 29%; 3, 30% to 49%; 4, 50% to 69%; 5, 70% to 89%; and 6, ≥ 90%). Darkness and homogeneity are rated on a scale from 0 to 4 (0, absent; 1, slight; 2, mild; 3, marked; and 4, maximum). The reliability and validity of MASI was tested by Pandya and colleagues, who recommended using a modified MASI (mMASI) with elimination of the homogeneity component.22

The most commonly used tool that reliably measures the effect of melasma on quality of life is the MelasQol.10,23 The MelasQol is a questionnaire containing 10 questions regarding the impact of melasma on the emotional condition, social relationships, and daily activities of patients.6,23 The patient ranks on a scale of 1 (not bothered at all) to 7 (bothered all the time) how he or she feels about the melasma.23 The total score is calculated by the sum of all scales for each question (total score ranges from 10 to 70). The tool has been validated for different countries and translated into Spanish, Turkish, French, and Portuguese.6

Diagnosis

The diagnosis is a clinical one. Light yellow-brown uniform macules/patches and dark brown macules/patches are 2 major dermoscopic features of melasma. In vivo reflectance confocal microscopy can be used to define the presence and location of pigment in melasma.24 Skin biopsy is infrequently warranted if the diagnosis is in doubt.

Differential Diagnosis

Among the differential diagnoses are postinflammatory hyperpigmentation, drug-induced hyperpigmentation, ephelides (freckles), solar lentigines, lentigo simplex, actinic dyschromia, exogenous ochronosis, nevus of Ota, nevus of Hori, poikiloderma of Civatte, Becker melanosis, café au lait macules/patches, nevus spilus, actinic lichen planus, frictional melanosis, tinea versicolor, linear and whorled nevoid hypermelanosis, and flat seborrheic keratoses.9,18

Complications

Melasma can be esthetically displeasing and socially debilitating. This is particularly true of facial lesions. The condition can have a negative impact on the quality of life, leisure activities, social life, and emotional well-being and may result in psychological disturbances.1,6,8,25

Prognosis

The prognosis depends on the risk factors and the histologic subtype. Melasma may disappear or improve significantly several months postpartum or after cessation of offending agents such as oral contraceptives. While epidermal pigmentation tends to respond better to depigmenting agents, dermal pigmentation responds variably and often unsatisfactorily.5 Recurrence is common, especially with reexposure to sunlight.1

Prevention

Avoidance of sun exposure, regular use of broad-spectrum sunscreens, and wearing of protective wide-brimmed hats and clothing when outdoors should be emphasized.26 Offending agents such as certain scented cosmetics, oral contraceptives, and photosensitizing agents should be avoided if possible.

Treatment

Treatment of melasma involves the use of topical depigmenting agents such as hydroquinone, retinoic acid, ascorbic acid, corticosteroids, kojic acid, glycolic acid, licorice root extract, resorcinol, and azelaic acid.1-4,10 Physical therapies such as chemical peels (eg, glycolic acid, trichloroacetic acid, salicylic acid, lactic acid), dermabrasion, lasers, and intense pulsed light have been used with varying degrees of success.3,4 Unfortunately, the results of monotherapies are usually disappointing, especially in dark-skinned individuals, who are are especially difficult to treat because of the increased risk of postinflammatory hyperpigmentation.10 Combinations of agents or modalities are often used, especially in refractory cases.1 The current limited evidence supports the efficacy and use of a triple combination product (modified Kligman formulation) with topical hydroquinone, a retinoid, and a corticosteroid, which is more effective than treatment with any 1 or 2 of the ingredients.4,26,27 Camouflage make-up is an important component of melasma management.10,26 Recent studies have shown that oral tranexamic acid may be a valuable adjunct in the treatment of refractory melasma.28,29 

Alexander K. C. Leung, MD, is clinical professor of pediatrics at the University of Calgary and a pediatric consultant at the Alberta Children’s Hospital in Calgary, Alberta, Canada.

Benjamin Barankin, MD, is a dermatologist and the medical director and founder of the Toronto Dermatology Centre in Toronto, Ontario, Canada.

REFERENCES:

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  2. Pandya A, Berneburg M, Ortonne J-P, Picardo M. Guidelines for clinical trials in melasma. Br J Dermatol. 2007;156(suppl 1):21-28.
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  15. Lee A-Y. Recent progress in melasma pathogenesis. Pigment Cell Melanoma Res. 2015;28(6):648-660.
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  17. Kim N-H, Choi S-H, Lee TR, Lee C-H, Lee A-Y. Cadherin 11 involved in basement membrane damage and dermal changes in melasma. Acta Derm Venereol. 2016;96(5):635-640.
  18. Vashi N, Kundu R. Acquired hyperpigmentation disorders. UpToDate. http://www.uptodate.com/contents/acquired-hyperpigmentation-disorders. Updated June 16, 2017. Accessed July 7, 2017.
  19. Madke B, Kar S, Yadav N, Bonde P. Extrafacial melasma over forearms. Indian Dermatol Online J. 2016;7(4):344-345.
  20. Kimbrough-Green CK, Griffiths CEM, Finkel LJ, et al. Topical retinoic acid (tretinoin) for melasma in black patients: a vehicle-controlled clinical trial. Arch Dermatol. 1994;130(6):727-733.
  21. Rodrigues M, Ayala-Cortés AS, Rodríguez-Arámbula A, Hynan LS, Pandya AG. Interpretability of the Modified Melasma Area and Severity Index (mMASI). JAMA Dermatol. 2016;152(9):1051-1052.
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