Consistency is key for spot care cosmetics. When can you expect results?

Lately, I've been interested in skincare products for freckles because I notice them every time I look in the mirror. Unlike blemishes, freckles don't go away easily, so I'm wondering if it's possible to improve them with skincare products alone. While there are many whitening products, not all seem to be effective for freckle control, so I'm having trouble choosing the right ingredients. I'd also like to know if there's a difference in how I should use skincare products in the morning and evening, and if the effectiveness of skincare products is reduced if they aren't used in conjunction with UV protection. For sensitive skin, please explain your criteria for choosing skincare products that won't irritate the skin, and if there are any long-term management methods that can help reduce the recurrence of freckles.