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Dermatologists study, diagnose, and treat diseases and ailments of the largest, most visible organ of the body, the skin, and its related tissues and structures: hair, mucous membranes, and nails. They study a patient's history, conduct visual examinations, and take blood samples, smears of the affected skin, microscopic scrapings, or biopsy specimens of the skin. They may order cultures of fungi or bacteria, or perform patch and photosensitivity tests to reveal allergies and immunologic diseases. They may also evaluate bone marrow, lymph nodes, and endocrine glands. Usually dermatologists send skin, tissue, or blood specimens to a laboratory for chemical and biological testing and analysis.