Dermatologic history Important information to obtain from history includes Personal or family history of atopy (suggesting atopic dermatitis) Occupational exposures (contact dermatitis) Long-term exposure to sunlight or other forms of radiation (benign and malignant skin tumors) Systemic disease (diabetes and Candida or tinea, hepatitis C, and cryoglobulinemia) Sexual history (syphilis and gonorrhea) Use of drugs (Stevens-Johnson syndrome, toxic epidermal necrolysis) Travel history (Lyme disease, skin infections) A negative history is as important as a positive history.