I need some help trying to figure out what's going on with my foot?

Recently, I've started noticing this pain in my foot mostly in the morning and occasionally throughout the day (mostly in the morning). Sometimes, it feels like something is popping out. The pain is coming from the ball of the foot (not under my big toe but all the other ones) and it's pretty swollen. I noticed this blue looking dot on it and thought it would just be marker or something I stepped on, but it wasn't. I tried wiping it off with some wipes, but nothing came off and I could tell it was in my skin. So, what is going on with my foot? I've always had problems with my feet, but not like this.