When should a person seek medical attention for a tick bite?

A person should seek medical attention if the tick's mouthparts remain in the skin after the tick has been removed because this can lead to localized infection or complications. The remaining mouthparts can create a foreign body reaction and increase the risk of disease transmission, as they can introduce pathogens into the bloodstream. It's essential to ensure that all parts of the tick are removed to minimize health risks.

In contrast, seeking medical attention when the tick is still attached or if it is easily removed is generally not necessary unless there are other symptoms present or the tick is a type that poses higher health risks. Additionally, the absence of swelling is not an indication of requiring medical help, as swelling can vary from person to person and may not always signify a problem. Thus, ensuring that the entire tick, including its mouthparts, has been properly and completely removed is crucial for a healthy outcome.