Please summarize the precautions after laser treatment for freckles and blemishes on the entire face.

I am upset every time I look in the mirror because my melasma and blemishes have become much darker recently, so I plan to get laser treatment soon. I am curious about any special precautions or contraindications I should take after the treatment. I would also like to know in advance how to wash my face once a scab forms on the treated area, and how much more thoroughly I should apply sunscreen than usual after the treatment. Since I enjoy exercising and tend to sweat a lot, would it be safe to go to the gym immediately after the laser treatment? Please advise on any helpful tips for aftercare that I should follow to prevent the side effect of the pigmentation becoming darker.