my BEST frnd has cancr. im da only 1 tht knwz n promisd not 2 tell ny1 bt shz gettn worse. im scared.. advice? My best friend has skin cancer on her head. Shes a VERY strong girl. Im the only 1 that knows except for her family. She told me that she does not want cancer to get in her way of doing anything & does not want to be treated any differently from how she is living right now. But recently shes been having to take stronger medication and told me that she might have to go through chemotherapy. I told my boyfriend about the situation without telling who my friend is. Since he is very religious, he tells me that i should tell more people and ask for their prayers. But I cannot tell a secret this big to her friends. Trust keeps friends together. But as she gets worse, im getting scared everyday. Ive never been in this situation before. I need help. please

Summarized question: How likely is the skin cancer in a strong girl to get worse?