Hi, Thanks for your query. Lump in this location can be enlarged lymph node, infected sebaceus cyst or ganglion cyst. Lymph node is usually movable and rounded. It is not quite soft, rather hard. Can be painful. Infected sebaceus cyst is a kind of benign soft tissues lesion. It tends to get infected. In such situation it becomes reddish, swollen and painful. Fever can be present as well. Ganglion cyst is connected with a joint (shoulder in this case) and filled with joint fluid. Pain is characteristic for this lesion especially when moving the limb. I suggest you to consult general surgeon with this issues. Soft tissues ultrasound should be done to diagnose it. Cyst or ganglion can be removed. If its a lymph node, biopsy should be done. I do hope that you have found something helpful and I will be glad to answer any further query. Take care