The flower on the shoulder is usually the BCG vaccination. BCG is a national unified planning can be free of charge to the newborn vaccine, the main function is to prevent tuberculous meningitis and cornual tuberculosis and other diseases, in most cases need to be vaccinated within three months after birth, the vaccination site is generally in the upper arm lateral deltoid muscle in the middle of the lower part of the, generally take the way of intradermal injection, the inoculation site will be formed close to the pattern of the marks. It should be noted that if you are allergic to BCG, suffering from acute illness, fever, immunodeficiency or immunocompromised, suffering from neurological diseases, etc., BCG vaccination, should be observed for half an hour after the vaccination to see if there are any adverse reactions, such as enlarged lymph nodes, fever, redness and swelling. Before BCG vaccination, you should consult the doctor at the vaccination center.