No that is not a blackhead. That is a zit. Looks like when you popped it you did not get all the junk out.... anyway you may want to see if there is more junk in it and then put poysporin on it and a bandaid on top.
Accutane worked fantastic for me. My skin was perfect. Yes there were side effects like a bloody nose, dry flaking skin and it was awful. But I used aquaphor for my lips and a gentle cleanser and got through it. I went through 2 courses of accutane and my skin was perfect for about a year each time but within the last year my skin has been going nuts. So the results at least for me were not permanent