Numerous skin lesions can be diagnosed by history and physical examination. Some cases require a biopsy or other tests. Dermatological history Important information from the medical history include: Personal or family history of atopy (indicates atopic dermatitis out) occupational exposure (contact dermatitis) Long-term exposure to sunlight or other forms of radiation (benign and malignant skin tumors) Systemic diseases (diabetes and candida or tinea (dermatophytosis), hepatitis C and cryoglobulinemia) Sexual history (syphilis and gonorrhea) Use of drugs ((Stevens-Johnson syndrome, Lyell’s syndrome () travel story (Lyme disease, skin infections) where a bland history is as important as a positive history. the history of the respective skin lesions is important, including the time and location of the initial presentation, spreading, changes in appearance and triggering factors. Dermatological examination Visual inspection is the main tool for the evaluation; many skin disorders can be identified by its characteristic appearance or the morphology of their lesions (Description of skin lesions). A complete examination of the skin, including the study of the scalp, nails and mucous membranes, takes place in the skin cancer examination and for clues to the diagnosis of a widespread outbreak to detect. Magnification with a hand lens can help to reveal morphological details. A held hand dermatoscope with integrated lighting is particularly useful to evaluate pigmented lesions. More information can be obtained by diascopy or Wood’s light.