Much more complex than just a few paragraphs of answers. See a dermatologist to 1. Educate you about SPF 2. Get your active acne under control 3. Treat your PIH 4. Give you prognosis on your texture and pin holes. These can be sorted with small beam lasers - certain 1927 nm lasers, C and B etc....
Probational laser has a big spot size- namely erbium laser give a BIG hole- hence grids and demarkation is commonly seen. I have both given grids and repaired other dermatologist grids myself. OK, its still only 4 weeks post. It takes 6-9 months for this to settle. 60-80% chance of this s...
These grid marks should resolve over time. Having done may profractional laser treatments, I have never seen them become permanent. I would expect that within another 2-3 weeks they should be much better if not gone.
In regards to additional laser, BBL would be fine 3-4 weeks after profractional...