Hello I m a 14 years old boy, I recently discovered a bump that is about 0.7 millimeter in radius on my neck , it is movable (not very but a few millimeters is possible), I I squeeze it doesn t hurt. What does this mean? Should get it checked? And also I have little bump on my left arm around the bicep towards the armpit, it is about 2 millimeters in radius and hurts when I touch it, and it appears to be connect to my vessels since it is appear slightly red and I can feel the vessel when I feel under the bump, is this something serious?