You can absolutely wear primer without makeup. Many people use face primer on its own to achieve a smoother and more even complexion. Primer works by filling in fine lines, blurring pores, and creating a smooth canvas for foundation or other makeup products. It can also be used on its own to improve the appearance of your skin. By applying primer alone, you can achieve a natural, matte, or radiant finish depending on the type of primer you use. Additionally, some face primers have added skincare benefits, such as hydrating, mattifying, and even acne-fighting properties, which can be beneficial for your skin even without makeup.
Read more about How To Choose the Best Makeup Primer for Your Skin Type
*Source: The NPD Group/U.S. Prestige Beauty Total Measured Market, Face Primer Division Sales, 12 months ending December 2022 and Nielsen U.S. xAOC, Cosmetics Category, Face Makeup Segment, Primer Type, L52 weeks ending 12.31.22