Toadmeister , that might be sealant coming through the sidewalls...And I wouldn't worry about it. To make suppler tires, some mfrs intentionally make the sidewalls relatively thin to the point of being porous. And then they are counting on the sealant finishing the job of making the sidewalls airtight. The alternative is much heavier, stiffer sidewalls, which will reduce ride quality.
If these tires had !,000+ miles on 'em, and we were actually seeing sealant (as opposed to some damp-looking spots), I might be more concerned. But this looks fairly normal.
PS: You might not see even this little bit of leakage if you use Orange Seal next time.