Arc welding and the risk of cancer.

Mrs LF, 71 years of age, presents with numerous squamous cell carcinomas (SCCs) on her hands (Figure 1). She comments that she had 'perfect' hands until recent years and had never been an 'outdoors person'. On questioning her about trauma or exposure to her hands she commented that she had frequently experienced 'sunburn' on her hands after assisting her son with his welding business.