I went out to travel and basked in the sun for 4 or 5 days. How can I recover?

The first is exfoliation. Simply put, wipe the sunburned area with salt or orange peel, and then apply a few moisturizing masks to replenish water. This is to avoid your melanin deposition and then cover it for two months. It is not obvious after autumn. Direct recovery is impossible. If you really don't like it, you can powder it to make it white when you go out.