Swollen external haemorrhoids are due to enlarged veins and inflammation, and medicines like diosmin are used to reduce swelling and improve vein tone rather than worsen it. Focus on soft stools by drinking plenty of water, eating fibre-rich food, avoiding straining, and using warm sitz baths to reduce discomfort. Maintain good toilet habits and avoid long sitting to prevent worsening. A doctor can confirm if diosmin is suitable for you and advise the right dose based on your condition.