Sclerotherapy or “sclero-foam” is a buzz word. This is where the typical liquid medication used to inject veins is mixed with air to create a foam-like substance. When injected into a vein, the foam displaces the blood, rather than mixing with it. This makes the medication stronger and potentially more effective. The images below show how foam is made, and what it looks like.
Gas and medication prior to mixing.
Mixing produces foam.
Foam consistency of medication.