Hey, I have two hard knots, one on each arm, and I'm really concerned as I've never had them before - I looked at the first 15 pages of this thread and got some useful information, however, would love to hear from someone directly. They are slightly sore to touch, but not too bad, some yellowing of the skin around the very hard veins that have risen to the surface of the skin, when I stretch my left arm out particularly, you can very well see the outline of it, the other side isn't as bad. Though, in the 1.5-2 weeks since it formed it hasn't seemed to improve at all? I usually never miss, always register properly, very safe, only really used heroin for IV, however that night I decided to IV Meth and 2 * 10mg Ambien (Zolpidem) which was ridiculous (not doing that again, more frighteningly realistic than anything I'd ever seen, hallucinating for the entire night and the next night, couldn't tell apart reality, way more intense than acid/strrooms) and I think that's what caused it. Would it be from the pills as it seemed to appear after that night - does that change anything, make it more dangerous for me? Should I get it looked at or when will they go away, am I at risk?