I am a 16 year old girl. A little more than three months ago, I went summiting. I developed a blister at the side of my left foot, and it has been there for the longest time. I was told not to pop it and yet it is very uncomfortable for me to walk from time to time. It is quite large, and the outside has a hard layer of skin that tears off little by little as I run or do any cardio. I’ve been avoiding shoes for sometime, and doing other things that was told would hhelp get rid of it. I clean it daily, but it still won’t go away. I’m going to take part in a strenuous hike in three weeks. I need to train but it hurts after my workout. What should I do?