Not just sensitive skin types should patch test new skin care products; everyone should do so to save future headaches.
Always, always, always patch test new skin care products before applying them on. Even if you don't have sensitive skin, certain formulations or ingredients (natural or synthetic) can irritate even the most normal skin. This can cause rashes that are red and irritated, as well as dry, itchy, and flaky skin. Products with thick and heavy emollients like coconut oil might cause undesired breakout-related reactions including clogging and acne, in addition to irritated skin.
Patch testing for irritation/ allergic reactions
Simply apply a small amount of the product to a small region of your face that can be easily covered, such as the underside of your jaw, a corner of your forehead, behind your ear, or the side of your neck, to do an allergy patch test. To effectively evaluate this product, there should be no other products on the skin. To see if you have a reaction, wait 48 hours.
Don't worry if you got a little carried away and slathered the new serum all over your face. Simply wash your skin with a gentle cleanser and follow with your favourite moisturiser if you notice any redness, irritation, or discomfort. You can also use a soothing product to the affected area, such as the Some by Mi AHA BHA PHA real cica 92% cool calming soothing gel.
Patch testing for breakouts
To see if a product causes you to break out, test it on a small area of your face like your cheek, chin, or anywhere else that is prone to blemishes. For a week or so, apply the product everyday (or as recommended) to the same region to see how your skin reacts. Keep in mind, however, that some skin care products, particularly acne treatments and anything containing retinol and strong acids (including lactic, salicylic, and glycolic acids), can cause breakouts!
Hope this helps! If you have any question comment down below.