Are thre lymph nodes in my upper arm?

Nearby: Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.

Yes: The lymph nodes of the upper extremity are divided into two sets, superficial and deep. The superficial lymph nodes are few ; of small size. One or two supratrochlear nodes are located above the humeral medial epicondyle (inner side ; superior to elbow). The deep nodes are chiefly grouped in the axilla (armpit), but a few may be found in the forearm ; arm along medial side of the brachial artery.