Diagnostic Considerations

Trichotillomania

Alopecic patches have unusual shapes and sizes and show broken hairs; no inflammation or epidermal change occurs. A scalp biopsy can be helpful if the diagnosis is difficult clinically.

Tinea capitis

The diagnosis is suggested by erythema, scaling, and crusting locally on the scalp.

Scarring alopecia and posttraumatic alopecia

These can be differentiated by the absence of follicular ostia or some degree of atrophy.

Syphilis

Syphilis rarely is seen but should be suspected in patients at high risk or with other signs or symptoms.

Telogen effluvium and androgenetic alopecia

Exclude these when hair loss is diffuse. In androgenetic alopecia, hair loss is patterned and usually is slowly progressive rather than acute. Differentiating telogen effluvium from diffuse alopecia areata is difficult in the absence of an obvious precipitating factor that can result in telogen effluvium. Noting hair loss on other hair-bearing areas can be helpful and favors a diagnosis of alopecia areata.

Differential Diagnoses

Workup

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Media Gallery

Alopecia areata affecting the beard.
Alopecia areata affecting the arms.
Patchy alopecia areata.
Ophiasis pattern of alopecia areata.
Sisaipho pattern of alopecia areata.
Alopecia totalis.
Diffuse alopecia areata.
Corticosteroid injection.
Treatment algorithm for alopecia areata.

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Author

Chantal Bolduc, MD, FRCPC Assistant Professor, Department of Dermatology, University of Montreal Faculty of Medicine; Physician, Innovaderm Research, Inc

Chantal Bolduc, MD, FRCPC is a member of the following medical societies: Canadian Dermatology Foundation

Disclosure: Nothing to disclose.

Coauthor(s)

Harvey Lui, MD, FRCPC Professor and Head, Department of Dermatology and Skin Science, Vancouver General Hospital, University of British Columbia; Medical Director, The Skin Centre, Lions Laser Skin Centre and Psoriasis and Phototherapy Clinic, Vancouver General Hospital

Harvey Lui, MD, FRCPC is a member of the following medical societies: Canadian Medical Association, American Society for Photobiology, Photomedicine Society, European Academy of Dermatology and Venereology, National Psoriasis Foundation, Canadian Dermatology Association, College of Physicians and Surgeons of British Columbia, North American Hair Research Society, Canadian Dermatology Foundation, American Academy of Dermatology, American Society for Laser Medicine and Surgery

Disclosure: Received consulting fee from Astellas for review panel membership; Received consulting fee from Amgen/Wyeth for speaking and teaching; Received honoraria from LEO Pharma for speaking and teaching; Received grant/research funds from LEO Pharma for investigator; Received grant/research funds from Galderma for other.

Jerry Shapiro, MD, FAAD, FRCPC Professor, Director, Disorders of the Hair and Scalp, The Ronald O Perelman Department of Dermatology, New York University School of Medicine

Disclosure: Nothing to disclose.

Specialty Editor Board

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, Texas Medical Association, Association of Military Dermatologists, Texas Dermatological Society

Disclosure: Nothing to disclose.

Lester F Libow, MD Dermatopathologist, South Texas Dermatopathology Laboratory

Lester F Libow, MD is a member of the following medical societies: American Academy of Dermatology, American Society of Dermatopathology, Texas Medical Association

Disclosure: Nothing to disclose.

Chief Editor

Dirk M Elston, MD Professor and Chairman, Department of Dermatology and Dermatologic Surgery, Medical University of South Carolina College of Medicine

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

Disclosure: Nothing to disclose.

Additional Contributors

Leonard Sperling, MD Chair, Professor, Department of Dermatology, Uniformed Services University of the Health Sciences

Leonard Sperling, MD is a member of the following medical societies: American Academy of Dermatology

Disclosure: Nothing to disclose.