Which of the following symptoms could indicate a concussion?

The symptoms associated with a concussion are characterized by effects on the brain that can occur after a blow to the head or body, leading to disturbances in normal brain function. Headaches are one of the most common symptoms reported following a concussion, and dizziness can also occur as a result of the injury impacting balance and spatial orientation. Both of these symptoms indicate that the brain's normal signaling pathways have been disrupted, which is a hallmark of a concussion.

In contrast, the other options are indicative of different medical conditions. Skin rashes and fatigue may relate to allergic reactions or infections but do not point specifically to a concussion. Similarly, a persistent cough and fever are generally associated with respiratory infections or illnesses, while joint pain and swelling typically indicate musculoskeletal injuries or conditions such as arthritis. Therefore, headaches and dizziness are the relevant indicators of a concussion in this context.