Is it okay to get treatments like laser toning in the summer? I have a question!

After returning from an outdoor vacation recently, my melasma and light freckles have gotten so dark that I felt I absolutely couldn't let it continue like this, so I am currently looking into laser toning.

However, my acquaintances advised me to postpone pigmentation treatments or laser procedures until autumn or winter, saying that getting them in the summer when the UV rays are intense can actually make the pigmentation darker. Doctors say that the season doesn't matter as long as I apply sunscreen properly, but I am actually a little worried about getting the procedure done in hot, sunny weather where I sweat a lot. What do you beauty experts think? I get so stressed every time I look in the mirror right now that I want to start immediately. For those of you who signed up for 10 toning sessions in the middle of summer, did you see good results without any side effects? Please give me lots of tips regarding skin health and procedures!