Christie Brinkley diagnosed with skin cancer during daughter's checkup

Model and actress Christie Brinkley was diagnosed with basal cell carcinoma, the most common form of skin cancer, while attending the checkup of one of her daughters, she said Wednesday. 

While the doctor checked her daughter, Brinkley decided to ask him to take a quick look at her. 

"It wasn't my appointment so I wasn't going to say anything but at the VERY end I asked if he could just look at a little tiny dot I could feel as I applied my foundation," Brinkley wrote in a post on Instagram. "He took a look and knew immediately it needed a biopsy!"