Hard lump: Hard lump at injection site is a small collection of blood called a hematoma. This occurs when the tip of the needle grazes a small blood vessel called a capillary. It isn't dangerous and will resolve on its own.
Answered 3/28/2017
750 views
A doctor has provided 1 answer
4 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question