Hindi ako sigurado kung anong exact na skin condition yan based sa description mo, kaya mas safe na i-check mo with your pediatrician para malaman kung normal lang ito o may kailangan ng treatment, better safe than sorry talaga sa ganitong concerns. A few of us din dito may babies na may different skin marks, pero bawat baby talaga e unique kaya best pag-usapan with your doc what you're seeing, lalo na kung lumalaki or nag-iitch.