Melasma Workup

  • Author: Andrew D Montemarano, DO; Chief Editor: Dirk M Elston, MD   more...
 
Updated: May 14, 2012
 

Laboratory Studies

Usually, no laboratory tests are indicated for melasma. Consider checking thyroid function test results. Wood light examination usually helps to localize the pigment to the epidermis or the dermis. Note that in many cases, the pigment is found in both locations.[7]

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Histologic Findings

Melanin is increased in the epidermis, in the dermis, or (most commonly) in both locations in melasma patients. Epidermal melanin is found in keratinocytes in the basal and suprabasal area. In most cases, the number of melanocytes is not increased, yet the melanocytes that are present are larger, more dendritic, and more active. Dermal melanin is found in the superficial and mid dermis within macrophages, which often congregate around small, dilated vessels. Inflammation is sparse or absent.

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Contributor Information and Disclosures
Author

Andrew D Montemarano, DO  Consulting Staff, The Skin Cancer Surgery Center

Andrew D Montemarano, DO is a member of the following medical societies: American Academy of Dermatology, American College of Mohs Micrographic Surgery and Cutaneous Oncology, American Society for Dermatologic Surgery, and MedChi

Disclosure: Nothing to disclose.

Coauthor(s)

Hugh Lyford  Surgical Technician, The Skin Cancer Surgery Center

Disclosure: Nothing to disclose.

Specialty Editor Board

James Fulton Jr, MD, PhD  Center for Cosmetic Dermatology; Consultant, Vivant Pharmaceuticals, LLC

James Fulton Jr, MD, PhD is a member of the following medical societies: American Academy of Cosmetic Surgery, American Academy of Dermatology, American Society for Laser Medicine and Surgery, Dermatology Foundation, International Society of Cosmetic and Laser Surgeons, and Skin Cancer Foundation

Disclosure: Vivant Pharmaceuticals Grant/research funds Consulting

Richard P Vinson, MD  Assistant Clinical Professor, Department of Dermatology, Texas Tech University Health Sciences Center, Paul L Foster School of Medicine; Consulting Staff, Mountain View Dermatology, PA

Richard P Vinson, MD is a member of the following medical societies: American Academy of Dermatology, Association of Military Dermatologists, Texas Dermatological Society, and Texas Medical Association

Disclosure: Nothing to disclose.

John G Albertini, MD  Consulting Staff, Dermatologic Surgery, The Skin Surgery Center; Program Director, ACGME Accredited Fellowship in Procedural Dermatology

John G Albertini, MD is a member of the following medical societies: American Academy of Dermatology and American College of Mohs Micrographic Surgery and Cutaneous Oncology

Disclosure: Nothing to disclose.

Joel M Gelfand, MD, MSCE  Medical Director, Clinical Studies Unit, Assistant Professor, Department of Dermatology, Associate Scholar, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania

Joel M Gelfand, MD, MSCE is a member of the following medical societies: Society for Investigative Dermatology

Disclosure: AMGEN Consulting fee Consulting; AMGEN Grant/research funds Investigator; Genentech Grant/research funds investigator; Centocor Consulting fee Consulting; Abbott Grant/research funds investigator; Abbott Consulting fee Consulting; Novartis investigator; Pfizer Grant/research funds investigator; Celgene Consulting fee DMC Chair; NIAMS and NHLBI Grant/research funds investigator

Chief Editor

Dirk M Elston, MD  Director, Ackerman Academy of Dermatopathology, New York

Dirk M Elston, MD is a member of the following medical societies: American Academy of Dermatology

Disclosure: Nothing to disclose.

Additional Contributors

The authors and editors of eMedicine gratefully acknowledge the contributions of previous Chief Editor, William D. James, MD, to the development and writing of this article.

References
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Confluent hyperpigmented macules in a malar distribution.
Melasma in a man.
 
 
 
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