I was just wondering if anyone knew roughly how long the average pimple should last?

So from the time in starts forming and you notice it, and then as gets bigger and forms a white-filled head, and then flattens.

How long is a healthy time for this process?

And at what point would you consider that pimple to have stuck around too long?

I know some people say that the longer is sticks around the more chance it has of forming an dented scar, so after how long should you start to worry about that.

Also, how do you know if a pimple is cystic?

Is it true that the tend to last weeks? Like they stay swollen lumps for weeks?

And they're painful right? Does this mean just a tiny bit if pain if you touch them, or painful even when you don't touch them?

Thankyou