1. History of Acrodermatitis Enteropathica -- 2. Epidemiology and Etiology -- 2.1. Epidemiology -- 2.2. Etiology -- 2.2.1. Molecular Etiology of AE -- 2.2.2. Hypothetical Etiology 1: the Alteration of Zinc Bioavailability -- 2.2.3. Hypothetical Etiology 2: a Defective Zinc Transporter -- 2.2.4. Alternative Forms of AE-like Zinc Deficiencies -- 3. Analysis of Disorder -- 3.1. Clinical Forms of AE -- 3.2. Nomenclature of Zinc Deficiencies -- 3.3. Acquired Non-hereditary Zinc Deficiency -- 3.3.1. Zinc Deficient Maternal Breast Milk -- 3.3.2. Zinc Deficient Caused by Metabolism Disorders -- 4. Clinical Symptoms -- 5. Diagnosis -- 5.1. Laboratory Diagnosis of Zinc Deficiency -- 5.2. Histopathology -- 5.3. Biological Diagnosis of AE -- 5.4. Clinical Diagnosis -- 5.5. Molecular Diagnosis -- 5.6. Differential Diagnosis -- 6. Disease Course and Treatment -- 6.1. Treatment -- 7. The Role of Zinc in Different Body Systems -- 7.1. Biochemistry of Zinc Metabolism -- 7.2. Skin and Hair Physiology -- 7.3. Gastrointestinal System and Other Organs -- 7.4. Neurological Development, Growth, and Mental Status -- 7.5. Enzymes -- 7.6. Endocrine System -- 7.7. Metabolism of Nucleic Acids -- 7.8. Mitosis and Meiosis Cycles -- 7.9. Cell Membranes -- 7.10. Synthesis of Proteins and Collagen -- 7.11. Immune System -- 8. History of AE in Adults -- 9. Iranian Hospital Cases in Literature -- 9.1. Patient One -- 9.2. Patient Two -- 9.3. Patient Three -- 9.4. Patient Four -- 9.5. Zinc Deficiency Similarities to AE in Infants (Fifth Patient) -- 10. Clinical Research -- 10.1. Abstract -- 10.2. Synopsis of Study -- 10.3. Purpose of Study -- 10.4. The Considered Hypotheses -- 10.5. Introduction -- 10.5. Methods -- 10.6. Ethical Considerations -- 10.7. Results -- 10.8. Discussion -- 11. Evaluation of Symptoms in Razi Dermatology Hospital -- 12. Case Photos.