yes could be a pest problem.
if it spreads or shows up on more plants you likely have Thrips
i hate those fuckers
i had them several times,
they are superhard to get rid of, so watch your plants, and if you see it spreads
go hard wirh your armory to kill them, especially after the grow
you may get the chemical bomb, and atch out in your next grow
if it does not spread it could be just an scaR FROM handling the plant.