Multiple sources describe dermatologists urging people not to ignore certain changes in their fingernails and related nail symptoms. The articles state that dermatologists identify several warning signs that could point to serious health problems and should prompt medical evaluation. Among the cited concerns are potential skin cancer warning features, including a black line on a nail that some conditions can cause. The coverage also mentions swollen fingertips, described as a possible indicator linked to lung disease. In addition to these two examples, the articles refer to a total set of five subtle nail changes that are easy to miss but may warrant attention. The sources emphasize that nails can reflect internal or skin-related issues and that persistent or unusual changes should be assessed by a healthcare professional. While the outlets focus on these visual warning signs, they do not provide a diagnosis for individuals and frame the information as guidance from dermatology experts to help readers recognize when to seek care.