Paint chip rear hub advice

If it really bothers you, you can get matching touch-up paint and cover it. Most bikes get chain rub in that area generally from lower limit screws not keeping the chain on smallest gear during quick downshifts. On alloy and steel frames its not a biggy, but because your frame is made from carbon, repeated strikes will surely cause problems if left unmitigated.

P.S. from your picture it looks like that section is made from alloy.