Venous malformations are abnormal clusters of veins that can occur anywhere in the body. They are usually present at birth and can grow over time. These malformations are made up of dilated veins that do not function properly, leading to issues such as swelling, pain, or skin changes in the affected area. These conditions are different from other vascular anomalies, such as arterial malformations or lymphatic malformations. Diagnosis often involves imaging techniques like ultrasound or MRI. Treatment options may include observation, compression therapy, or surgical intervention, depending on the severity and symptoms.