1 day post op, woke up with whiteheads allover face. Did I mess up my skin by getting sun exposure after microneedling?

I recommend following up with a cosmetic dermatologist for skincare and after care recommendations. I recommend growth factors, exfoliating cleansers, and stem cells with light therapy. I always combine microneedling with prp and lasers to get the best outcomes. Best, Dr.. Emer

Your skin is very sensitive immediately after the microneedling procedure and I would talk to your physician about which products you can use after treatment. I would not worry about the whiteheads at this point. They will resolve. 

Hi yesssie,
The period post Microneedling is very sensitive. For the first 2 days, just use Cerave. Your skin will be sensitive to products that worked fine with you so no cleasers, or skincare that contains any kind of exfoliator or acids. On the third day you can begin using sunscreen and gradually go back to your normal regimen by the 5th or 7th day.
Don't worry about the whiteheads at this point.
All the best, 
Justin Harper, M.D.