Photoexposure and risk factors for skin cancer: an evaluation of behaviors and knowledge among university students.

Background: Skin cancer is the most common neoplasm in Brazil. It is extremely important to understand the attitudes that influence protection from and exposure to the sun's ultraviolet rays in order to prevent this clinical condition.

Objectives: To evaluate photoexposure and photoprotection habits and knowledge of risk factors for skin cancer, with the purpose of describing behavioral patterns of university students in relation to the effects of the sun.

Coexistence of prostate cancer, gynecomastia, renal failure, melanonychia, and wrist lump.

Although prostate cancer is among the most frequent malignancies in the elderly, this tumor may be under-reported, and it seems that its socioeconomic burden is not well-estimated. Chronic urinary obstruction caused by the cancer may cause renal failure, with hemorrhagic tendency, neurologic disturbances, cutaneous disorders, and diverse fingernail changes. Black or brown nail pigmentation has been associated with benign and malignant conditions, including antineoplastic drugs' side effects, subungual metastases, and melanoma.