One of the main causes of painful scrotal swelling is testicular torsion. This is an injury or an event that causes a testicle in the scrotal sac to twist and cut off blood circulation. This very painful injury could cause tissue death to the scrotum in a matter of hours. Medical conditions and diseases can also cause the scrotum to swell.
As said, credit and debit cards (cartes bancaires or cartes bleus) are widely used in France. This is also practical as automatic payments are common in France for things like train/metro tickets, parking, motorway tolls, etc.
Flag of France. The national flag of France is a tricolour flag featuring three vertical bands coloured blue (hoist side), white, and red. It is known to English speakers as the French Tricolour or simply the Tricolour (French: Tricolore). The royal government used many flags, the best known being a blue shield and gold fleur-de-lis (the Royal Arms of France) on a white background, or state flag.