Why is this spider bite acting like this? Is it because of my Accutane? (photos)

I got a spider bite 6 days ago and it has a tiny black head in the main bite area, but its spread. It is not painful and not having any other symptoms. Ive had bites before taking accutane and never did this rash thing. Should i just go see my derm about it, or should I just leave it alone? Its as if its chafing and blood blistering. Ive just left it alone, but wasnt sure if because I am on accutane, I would be in trouble?

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