I've just alumier MD 0.25 retinol for ages and I've never had an issue or an adverse reaction. Just started with 0.5 from ZO Skin health (obagi) and it keeps breaking me out, no matter how slow I go or how much moisturiser I sandwich between the retinol. Is it possible that the zo skin health retinol just doesn't agree with me? Took a break for a month, then tried the tiniest amount last night and have tiny pimples all over my face! Help!