Getting a bruise (sometimes called a haematoma) after an injection is not unusual. It usually arises simply due to bad luck - but can sometimes be related to problems in the persons blood clotting pathways.
You need to remember that most injections are done with a very small needle. These needles are designed to cause as little trauma as possible to the tissues - but sometimes a small vein or artery might be scratched by the needle as it goes into the skin and muscle. This blood vessel then leaks a bit - causing a bruise to appear several days later.
A bruise after an injection can sometimes be painful - or sometimes not. Most will fade quickly without the need for any treatment.
If you find that you get severe bruising every time you have an injection then you should mention this to your doctor because it could point to a problem with blood clotting and you may need some investigations done.
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