Cracks in carbon fibre is never a good look
They are tiny, and it looks like this area is painted so could be paint? But you're right. Not a good sign.
What rims are they?
@Turkish started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
Cracks in carbon fibre is never a good look