hey mizchari,
i take biotin 5000 mcg a day and do not break out. i recently took 1000 mcg and didnt break out. but i have also never had any real problems with my skin. however, my sister has acne issues and she tried to take biotin 1000 mcg QD and broke out.
long hair dont care: i would assume the "hair pills" have other vitamins && "special herbs" in them that naturally promote hair growth. like prenatal pills && folic acid && biotin.