Hello, my child will be turning 3 years this July. He weighs 11 kg and 93 cm long. He is a very active and smart kid. The reason I am posting here is because I am little worried. The cause being as you can see in the attachment, I see a blue coloured lump like thing on his neck on the nerve whenever he cries or exerts some force on the neck muscle. Please let me know if it is normal or if I need to visit the doctor. Thank you.