What does an arm look close to on fluid meth?

does it have busted vein? do they look like bruses?What does an arm look close to on fluid meth?
I know a methadone addict. Her arms be always bruised, and her vein were so collapsed that she injected it between her toes. If you are trying to identify a meth user it's pretty easy, when they involve it their arms get goosebumps and they perform very unnatural, they also steal and lie deeply. She used to pick at the skin on her arms as she thought there be bugs under it. Very discouraged.
from a recovered meth addict here go.
arms will be skinny, maybe sores from picking.
track grades if fresh can be bruised, or there can simply be a lightheaded red thin string that looks like a mark going over the top of the vein if a bit elder and the scars haven't faded.