Using sunscreen that expired a few months ago is generally not harmful to your skin, but its ability to protect you from UV rays may be diminished. The sun protection factor (SPF) can decrease over time, so the sunscreen might not be as effective as when it was within its expiration date.

If you decide to use expired sunscreen, consider these points:

• Reduced effectiveness: The SPF may be lower, increasing the chance of sunburn.
• No increased irritation risk: Unless the sunscreen’s smell, texture, or color has changed, it usually won’t cause new skin irritation.
• Check the product: Avoid using it if it looks or smells off.

For the best protection, it’s recommended to use sunscreen before it expires and store it in a cool, dry place. If you expect prolonged sun exposure, using a fresh sunscreen is safer.

If you want, I can explain how to choose the right sunscreen or how to apply it properly. Meanwhile, consulting a dermatologist can help you select the best sun protection for your skin.