Differential Diagnosis – “H”

Generalized

1. Acute blood loss.^∗

2. Childbirth.

3. Crash diets (inadequate protein).

4. Drugs:

   1. •

      Coumarin.

   2. •

      Heparin.

   3. •

      Propranolol.

   4. •

      Vitamin A.

   5. •

      High fever.

5. Hypothyroidism and hyperthyroidisms.

6. Physical stress (e.g., surgery).

7. Physiologic stress (e.g., neonate).

8. Psychologic stress.

9. Severe illness (e.g., systemic lupus erythematosis).

10. Cancer chemotherapeutic agents.

11. Poisoning:

    1. •

       Thallium (rat poison).

    2. •

       Arsenic.

12. Radiation therapy.

13. Secondary syphilis: “moth eaten” alopecia.

Localized

1. Androgenetic alopecia:^†

   1. •

      Male pattern.

   2. •

      Female pattern.

2. Hirsutism.

3. Alopecia areata.

4. Trichotillomania.

5. Traction alopecia.

6. Scarring alopecia:

   1. •

      Developmental defects: aplasia cutis.

7. Physical injury: burns, pressure.

8. Infection:

   1. •

      Fungal: kerion.

   2. •

      Bacterial: folliculitis, furuncle.

   3. •

      Viral: herpes zoster.

9. Neoplasms:

   1. •

      Metastatic carcinoma.

   2. •

      Sclerosing basal cell carcinoma.

10. Lupus erythematosus.

11. Lichen planus.

12. Cicatricial pemphigoid.

13. Scleroderma.