I started reading your post and thought it was just like what happened to me several years ago when I tried adding a biotin supplement. I was taking 5000 mg/day and got horrible, large acne cysts. I cut down to 2500 mg but I think it was too late; my skin already screamed that it didn't like the extra biotin and seemed to be holding onto cysts even at the reduced dose. I stopped completely and the cysts calmed down and eventually went away. I do still get a bit of extra biotin in my multi-vitamin, but it doesn't aggravate my skin.
All that aside, I may have an a slight increase in growth at the time, but it was definitely not worth the hassle with cystic acne.
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