<s>[INST] My son has 2 bruises on his back right where his dimple things are he is also tired all time. I don't know hw he got the bruises and they don't hurt him when I touch them. My son is 4 years old and after having a ultrasound done on his next it showed a 3.5 cm lymph node. Could this all be related? Thanks [/INST] Hello!Thank you for the query.Tiredness, enlarged lymph nodes and easy bruising sound like some hematologic disease. However same symptoms can be present with some infection. Please do not ignore his symptoms. I suggest you to consult hematologist or pediatrician with his symptoms. Further diagnostics is necessary to determine the reason.Hope this will help.Regards. </s>