OMG the same thing happened to me. I have always had pretty clear skin, a friend of mine was raving about biotin making her hair grow faster and I was like shock because 3 days after taking the pill, my skin starting developing horrrible cystic acne like all over my chin...I was sooo upset, but it cleared up alittle bit after I stopped taking the pills.I bellieve vitamins can give you acne. I wanted my hair and nails to grow fast so I went to the Vitamin store and bought some Biotin. I started getting horrible cystic acne and oily skin after I started taking it. I mean it was horrible!! I had to stop. When I did the acne stopped in a few weeks.