I used my own blood as part of a costume.
What did you need to use real blood for?
I wanted to write something on my arm.
I understand that you wanted to make your costume seem interesting, but hurting yourself in the process is not a good idea. Injuring yourself so much that you bleed can lead to potential permanent damage to your body. Next time, you should just buy fake blood from a costume shop.
I don't regret it. The costume ended up being amazing so it was worth it. I don't like to be logical.
It is dangerous to hurt yourself like that though. The best thing to do for the next time is to get some fake blood, it will do the same thing just hurt a lot less.