Hi,
I think we should try to find what ingredients that we are sensitive or allergic of. Some people cannot tolerate perfume, others cannot tolerate chemical sunscreens (like me) and some cannot tolerate certain oils or herbal extracts. So, even though certain products claim that they are safe for sensitive skins, it may still irritates. Most products for sensitive skins excludes perfumes.
I made it a habit to read all ingredients of a product before buying it. Once purchased, I usually keep the box as reference of the ingredients.