Injecting filler into a vessel is thankfully very rare. Fanning it out may limit exposure of the product into the vessels. Sometimes local used can cause the vessels to shrink as well making it more difficult to occur.
These answers are for educational purposes and should not be relied upon as
a substitute for medical advice you may receive from your physician. If you
have a medical emergency, please call 911. These answers do not constitute
or initiate a patient/doctor relationship.