(Front Royal, VA) -- A birthmark became a deadly cancer. More from Thomas Cage...Preview: WRAP SCRIPT:Preview: Says Viviana Tisera fighting back tears, mother of now deceased 20 year old Mari Tisera. The George Mason University student died of melanoma in June of 2023, after a small birthmark on her toe changed shape and spread cancer to her neck, brain, and spine. Sun exposure can increase risk, but so can certain types of moles and birthmarks. According to Dr. Geoffrey Gibney speaking with NBC4Preview: Early detection is key.Preview: Melanoma is the 2nd most common cancer in young people ages 15-19.