Detailed answer

Dark spots, also known as hyperpigmentation, are usually caused by an overproduction of melanin in the skin. This can be triggered by various factors such as sun exposure, hormonal changes, inflammation, or injury to the skin. Heart conditions usually do not directly cause dark spots. However, certain heart conditions may affect blood circulation, leading to insufficient oxygen and nutrients reaching the skin, which can potentially contribute to a dull complexion. It is important to consult with a healthcare professional or dermatologist for a proper evaluation and diagnosis of any skin concerns.