I have a friend who went to give blood the other day, says her blood usually flows very fast and is over right away, but this time say blood started flowing fast as usual then slowed way down...took longer than normal for them to finish her blood draw. she now has a lump in her arm where blood was drawn from and says it only hurts if you push on it or put pressure on it. wondering if this is a clot in vein and she should just use warm compresses on it, or something else.
I welcome you to Chat Doctor I am Chat Doctor and I will be answering your health query have gone through your question. It appears to be thrombophlebitis, which is inflammation of vessel due to formation of blood clots. It appears to be superficial thrombophlebitis because of the cannula.  You can use Aspirin which have both anti-inflammatory and anti-platelets properties along with graduated compression in form of compression stocking of the affected area. Furthermore, you need in detail assessment of the affected limb, there might be thrombi in deep vein, which might dislodge leading to catastrophic consequence. Wishing you rapid recovery. I hope my answer will help you. Do rate it, if you like it. Regards