Does isotretinoin cause sebaceous cysts or steatocystoma simplex?

I have been on accutane for a week. Before I started accutane, I had a huge lump (cystic pimple) on my cheek--it had been there for at least a month. It was hard to the touch and big, 2 centimeters in diameter. It felt like a flat elevated plateau, and it hurt. This lump has not gotten any better (and I don't expect it to in 1 week), but today I noticed it being extra red and sensitive. I'm worried that this is not a normal pimple and is a steatocystoma simplex. Is there any way for me to tell?

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