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A common sign of deep vein thrombosis (DVT) is the presence of redness and warmth in the affected limb. This occurs due to inflammation and increased blood flow to the area surrounding a blood clot. The thrombosis prevents normal blood flow, leading to swelling and changes in temperature and color. Healthcare providers often assess patients for these symptoms, particularly in individuals who are at higher risk for DVT, such as those who are immobile, have undergone surgery, or have certain underlying health conditions.

Other options such as fever and cough can indicate respiratory or systemic issues rather than DVT. Dry skin does not characterize DVT, and while a history of allergies is important in patient assessments, it is unrelated to the signs and symptoms of deep vein thrombosis. Understanding these distinctive signs is crucial for early identification and treatment of DVT, preventing potential complications such as pulmonary embolism.