Containers for the production of a foamed sclerosant composition are provided. The containers includes a container body for foaming having one or more sidewalls extending between a top and a bottom of the container body, a foaming space being defined in an interior of the container body. Further, the foaming space contains a mixing component configured for rotating, particularly on the bottom of the container body, and including a magnetic part and a shape suitable for mixing. The container also includes a female coupling member for mating with a tip of a syringe, such that the syringe can be used for extracting the foamed sclerosant composition, and the container includes at least one opening which is covered by a gas-permeable barrier.

A bubble formation apparatus (500) includes: a rotor (100); a container (200) in which the rotor (100) is housed together with a liquid (LQ) and a gas (GS); and a rotary device (300) that causes rotation of the rotor (100) with the rotor (100) being pressed against an inner lower surface (221) that is the inner surface of the container (200). A bubble is formed by periodically repeating pressurization and depressurization of a mixture of the gas (GS) and the liquid (LQ) in a gap between the inner lower surface (221) and a portion, pressed against the inner lower surface (221), of the rotor (100) due to the rotation of the rotor (100) by the rotary device (300).