doesn't know about cold causing bumps/blisters/bruises to get any worse, he has never had any get worse due to cold.
SWIY is right about the warm water/cloth bringing veins closer to the skin's surface, making them easier to hit. SWIYs friend may have suggested a warm compress after a shot because if any dope was missed the warmth and the pressure of the compress helps the body tissue absorb the dope that didn't get into a vein.
is not absorbed by body tissue well, so greater care must be taken to prevent missing. Because the body doesn't absorb meth
very well, missed shots are more susceptible to infection/abcess/etc. than say a missed heroin
If a shot of methamphetamine is missed it will be quite painful and the area around the injection site will quickly swell some and turn red. Apply a warm cloth to the injection site and apply pressure, gently kneading/massaging the area. Do this 4-5 times a day until there is no pain, swelling, or redness.
Monitor the area of the miss for signs of infection/abscess. These include:
-Swelling of the area that doesn't stop after a day or two
-Redness around the area that doesn't go away or gets worse
-The area is warm to the touch compared to other parts of the body/skin
-Pus/Discharge from the area
If SWIY thinks the site could be infected it is important to seek medical treatment right away.
Some other better injection techniques:
-New rig every time one is available
-Never, ever share any equipment, especially if touched by anything that has also touched blood
-Wash/sterilize hands/arms/injection site and use as clean of a prep area as possible
swab immediately after injection as this prevents blood clots from forming
-Many, many, many more. Please check the forums and the documents
archive on IV drug use
for lots of other harm reduction
and safer/better injection information.