[Product Request] Is kojic acid soap useful? Are there alternatives?

Hi everyone, I have really uneven skin tone throughout my body. My face and chest are much lighter than the rest of me. My legs and forearms on the other hand are much darker like it might as well belong to someone else. And let's not even talk about my inner thighs. I also have acne scars on my chest and back. I came across posts and articles about kojic acid products and am considering buying one. Almost bought it today but I saw a lot of reviews about negative side effects like skin peeling, burning, carcinogenic ingredients and such. And now I'm concerned. Is kojic acid soaps and stuff useful? Are the side effects as bad? If so, are there alternative products that I could use? I'm a 26F who's only just started wanting to take care of myself. Any advice is appreciated.