Can I see results with just one use of the melasma skin booster?

As I get older, melasma has started appearing, and now it's so stressful because even makeup can't cover it up. Since cosmetics aren't working, I was recommended a melasma skin booster, but it's unfamiliar to me, and I've been hesitating because I'm worried about side effects, so I'm finally leaving a post.

I'm really scared it will be extremely painful since it's an injection. Is it bearable if I apply numbing cream? I'm also worried about whether the bumps or redness on my face will last a long time after getting the melasma skin booster. Also, can I see my complexion brightening after just one session, or do I usually need to receive at least three sessions consistently to maintain the effects?

Melasma skin boosters are quite expensive. As a timid beginner like me who doesn't know much about beauty, do you have any tips for choosing a clinic without failure? If anyone has received the treatment, please share your honest reviews or any precautions.