The way most fragrance ingredients impart scent is through a volatile reaction, which almost always causes irritation and some amount of inflammation. Research has established that fragrances in skin-care products are among the most common cause of sensitizing and allergic reactions.
You might be thinking, well my skin doesn’t look irritated or inflamed so the fragrance must not be a problem. In reality, skin on the surface often keeps the fact that it’s being irritated a secret with no reaction at all. Below the surface, irritating ingredients can cause collagen to breakdown, get in the way of skin’s ability to fight environmental damage, and hamper skin’s ability to heal. All of this can be taking place in the lower layers of skin without any obvious signs on the surface! The irritant reaction you don’t see or feel is nonetheless hurting your skin’s ability to reduce wrinkles, firm skin, or look younger!
For those with sensitive skin, especially when the problem is rosacea or acne, fragrance can be seriously irritating and that will show up on the surface. Fragrance of any kind (including natural fragrant oils) should be avoided at all costs.