Diffuse Hair Loss (Alopecia) - Differential Diagnosis Algorithm



Scarring - Irreversible-biopsy required

 • Lupus erythematosus

 • Lichen planopilaris

Pattern

 • Androgenetic alopecia

Anagen Effluvium

 • Chemotherapy

 • Loose anagen syndrome

Discrete Patches

 • Alopecia totalis (all scalp and facial hair)

 • Alopecia universalis (all body hair)

Telogen Effluvium

 - Endocrine

    • Hypothyroidism

    • Hyperthyroidism

    • Hypopituitarism

    • Post-partum

 - Dietary

    • Iron deficiency

    • Zinc deficiency

    • Copper deficiency

    • Vitamin A Excess

 - Drugs

    • Oral contraceptives

    • Hyperthyroid drugs

    • Anticoagulants

    • Lithium

 - Stress Related

    • Post-infectious

    • Post-operative

    • Psychological stress



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