Sensitive skin is described by being easily irritated and reacting to various triggers.
If you have sensitive skin, you would likely react poorly to many new products or ingredients. For example, fragrances are a frequent trigger for sensitive skin and can cause irritation when used.
Sensitive skin usually looks red, dry, or flaky when irritated. Sensitive skin feels itchy, tight and rough, and characterized by stinging and burning sensations during a reaction.
Sensitive skin can be caused by weakened skin barriers, allergic reactions, or harsh cosmetic ingredients. To add on, sensitive skin might be caused by a genetic reason and people might be born with sensitive skin because of their genes from their parents.
Hydrating emollients are usually good for sensitive skin such as hyaluronic acid, shea butter, glycerin, aloe vera, etc.
One rule of thumb is looking for an ingredient list on the shorter side so the ingredients are less likely to irritate your skin. You can also look for hydrating ingredients and products that say "non-comedogenic" meaning they won't clog pores.
Sulfates, fragrances, and harsh alcohols are common irritants and should be avoided if you have sensitive skin.
Colloidal Oatmeal - It has anti-inflammatory and soothing properties which helps protect the skin's barrier and calm & prevent irritation.