The faintly emerging signs of this guy.

After my second childbirth, I had all my melasma removed with IPL, but I'm stressed because this stubborn melasma is starting to come back little by little.

I think it's still too early to get a shishu, but what are some preventive measures? Wearing sunscreen to avoid UV rays is obviously essential, but if there are other preventive methods, I would appreciate your help.