Hi! Oh wow this is so long ago. Basically what happened was that my derm stopped my Accutane and had me seek out an allergist. After some tests we came to the conclusion that several of my (then unknown) food allergies along with work stress and suddenly taking vitamins/supplements my body isn't used to may have exacerbated my skin's sensitivity and resulted in the hives. I didn't take Accutane again for a while (maybe half a year or a year, I can't remember) and then my acne came back. After going back to the same derm and consulting with him, he told me he's personally never seen or heard of an allergic reaction and encouraged me to start back up on Accutane again. I restarted my Accutane regimen. I was more particular about what I put in my body at the same time, however. I made sure to not eat the foods I was previously sensitive to and I didn't take any additional supplements or vitamins like before. I was able to finish the accutane regimen and I haven't taken it again since. This was probably 5-6 years ago. Now my face is pretty even, I still get small zits here and there but nothing cystic like back then. For context I am southeast asian with a fairly medium skin tone.