Looks like mold flash (unwanted material that's squeezed out from the narrow gap where the pieces of a mold fit together due to the high injection pressure) and

Looks like mold flash (unwanted material that's squeezed out from the narrow gap where the pieces of a mold fit together due to the high injection pressure) and it's normal for some to come off. There's doubtless a cleanup step later where any leftover material is removed.