Hi, do you always know if you hit artery or nerve? I was hitting in a old site in my arm, but little bit upper than usually. When i was sticking the needle in ny arm i felt pain and ”bite” so i didnt push the plunger and took it out fast. It didnt started bleeding badly, only small amount of blood came out of it but the pain was pretty bad and felt like zap. Afterwards it is little swelled and when touched it have a small amount of pain abs tingles. I dont know if it could been an arttery hit bcs i wasnt that deep but i guess you never know. If any of you have hitting the nerve before could you share your experience and how dangerous it is? Thanks if you can help 
Here is also pic where the site is, is there big risk at this site to hit artery or is there lot of nerves? Ive used it few weeks now bcs my elbow areas are very scarred and almost collapsed.

Here is also pic where the site is, is there big risk at this site to hit artery or is there lot of nerves? Ive used it few weeks now bcs my elbow areas are very scarred and almost collapsed.
