1. Biopsy collection : why, when, where and how -- 2. Clinical lesion definitions, recommended methods of biopsy sampling, and representative histologic lesions -- 3. Histopathologic responses of the skin to injury -- 4. Tumors and tumor-like masses of the skin -- 5. Laboratory techniques for tissue processing and staining -- 6. Glossary -- 7. Differential diagnosis of clinical lesions and lesions in selected anatomic locations.