Sayang, this is something you really perlu jumpa doctor or specialist untuk check properly, cyst issues kat baby kena proper diagnosis, especially tengkuk area ni sensitive. I know it's scary reading different info online, but a pediatrician or ultrasound specialist boleh terang-terang explain the best path forward untuk baby you. Take a deep breath, many things can look worrying tapi expert bolehandle! Jangan worry sendiri, go see your doctor k?