Which condition is described by the formation of dense tissue scars?

The formation of dense tissue scars is best described by keloids. Keloids occur as a result of an abnormal healing process where excess collagen is produced during the repair of the skin after an injury. This leads to the development of raised, thickened areas of scar tissue that extend beyond the original wound site. Keloids can continue to grow over time and can become symptomatic, causing itching or discomfort.

The other conditions listed do not involve tissue scarring. Palpitations refer to an awareness of heartbeat irregularities, which is a cardiovascular symptom. Odynophagia is characterized by painful swallowing, often associated with inflammatory conditions of the throat or esophagus. Orthopnea is a condition experienced when a person has difficulty breathing while lying flat, often related to heart or lung issues. Understanding these distinctions is important in recognizing the specific characteristics of keloids as opposed to other medical conditions.