Hi and thank you for your question! While rare, injection of fillers can interfere with blood flow – when filler is injected inadvertently into a blood vessel which is extremely rare with proper technique but can have catastrophic consequences, but more commonly when the filler exerts some pressure on a nearby vein and slows its blood flow. There are blood vessels on nose and given the limited space, there is the risk but it is very low. After almost ten years and several thousands of filler injections, I have never seen any patients with filler injected into a blood vessel, but perhaps 3-4 patients with signs consistent with filler pressuring on a nearby vein but even those cases all had full recovery with injecting some enzyme and topical application of vasodilators. So to sum it up, yes the risk is there and we all must be aware of it, but it is very small and you and your injector should be vigilant on the warning signs to be able to manage it quickly if it occurs. I hope it helps and good luck!
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