Yes, you can apply sunscreen without moisturizer, but it is not recommended to skip moisturizer in the long run as it can affect the skin. Sunscreens are basically moisturizers with UV filters added by chemists to provide additional sun protection. They still have the same hydrating effects as a typical moisturizer. However, sunscreens can be more comedogenic than moisturizers, which is not good for people with oily skin or acne-prone skin. Additionally, sunscreens may not provide enough moisturizing effects for people with dry skin.
If you decide to use both a moisturizer and sunscreen, use your moisturizer first, then wait a few minutes, and then apply your sunscreen on top for optimal results. Some sunscreens have a matte finish and may not provide enough hydration, so if you have such a sunscreen and have dry skin, you can still benefit from using a moisturizer. When replacing your moisturizer with sunscreen, make sure you do not apply sunscreen brands that can irritate your skin or cause breakouts. Choose sunscreen that is labeled oil-free, non-comedogenic, or perfume-free, as they are safer, especially for sensitive skin.