One of the most common irritants in skin care products is Fragrance, sometimes listed as Parfum. So look out for that. It is usually listed towards the bottom of the label. Gently, gently is always the approach with sensitive skin. Notice how products feel when you first apply them. Anything that makes your skin turn red, or makes it sting should be washed off immediately and avoided thereafter. Avoid mechanical scrubs, anything with AHA's in them and SD Alcohol. In my experience, while Aloe Vera is a lovely ingredient for many people, some people are allergic to it and this shows up in a lot of products these days. Like wise, as lovely as essential oils are, there are some products around with high enough levels to cause irritation to some skins. You need to become your own detective, scrutinise labels and notice how your skin reacts. Maybe keep a log of your reactions, note the product and even keep the label so you can see which ingredients keep showing up. Be wary of products with overly long labels and stick to more simple formulas until you know what the problem is. Look out for products containing anti inflammatory ingredients that will help to soothe your skin and keep it happy.