Can Leopard Geckos get cancer?

I have a 17 year old female leopard gecko. Within the last six months she has developed a bump on her nose, almost on the tip but closer to her left nostril. it is starting to get bigger. the skin around it and on it looks totally normal ( maybe a little stretched). she doesn't act like it hurt her. she is eating and drinking normal, shedding a little more then she used to, but I'm uming that's due to old age. she doesn't mind if I touch it...or push on it. I'm just concerned about it. I have a very limited income when it comes to extra vet bills, but its not like that is an option, because I live in the middle of no where and the nearest vet that will see a gecko is a 3 hour drive one way. Any information, or experience in the area would be greatly appreciated. Also, what is the average life expectancy for a female leo that has never been bred?