I injected meth into the crook my arm, the vein on the inside closest to my body. I used a brand new needle, cleaned the area properly, slowing inserted the needle at the right angle, drew back to ensure that I was in the vein, afterwards I slowly injected the meth, with no bubble, pain, or burning of any kind. Then I slowly pulled the needle out and immediately applied pressure to the site for about 30 seconds until the bleeding stopped. Then I noticed a small bump where I injected, there was no redness, no pain, it was soft. Why did that happen?
Thanks for your question on Chat Doctor. I can understand your situation and problem. By your history and description, it seems that you are intravenous Chat Doctor.  Your technique is proper and with due aseptic precautions. But repeated injections cause local site inflammatory changes and thinning of vein. So even if you apply pressure for 30 seconds after injection, possibility of bleeding from vein into the subcutaneous tissue is high due to local inflammation and thinning of vein. So you might be having extravasated blood which is giving you feeling of lump at injection site. The best treatment for this is avoided intravenous 