Hematomas: With injection drug use -there is a small trauma to the skin/soft tissues/veins each time. Sometimes there could be bleeding under the skin after an injection- that will form a small hematoma or blood bruise. It will shrink down over time and become fibrotic-so you're probably feeling those. An abscess occurs when that becomes infected and it's a big throbbing mass of bacteria. Hope u can get help
Answered 2/17/2016
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