Questions about purchasing and using freckle ampoules

The aftereffects of the UV rays I let my guard down all summer are so bad that I need a freckle ampoule under my eyes and around my cheekbones.

I am concerned that my dull and blotchy skin tone makes me look gloomy.
Since dermatological treatment is burdensome due to work conditions and time constraints, I plan to start intensive care at home using a functional product, a freckle ampoule.
There are various ampoules on the market, each boasting powerful effects, but it can be difficult to find information on which product to choose.
It's often expensive too.
I would like to ask for advice on a freckle ampoule for effective freckle management at Maypure.
If the freckle ampoule is a product that can be used during the day, is there anything special I should be careful about when pairing it with sunscreen?
If you have a special intensive ampoule care routine that you use for a week or a month, I would appreciate it if you could share it with us.