Armpit lumps are often a source of concern, but they can have various causes, many of which are not serious. Commonly, these lumps result from swollen lymph nodes, often due to a minor infection or inflammation. They can also be cysts or benign lipomas. While most armpit lumps are harmless and temporary, it's important to monitor them. Changes in size, consistency, or the presence of pain are key factors to watch for. Persistent lumps or those that are hard and immovable warrant a visit to a healthcare professional for further evaluation, as they can occasionally indicate a more serious condition.