Hello
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Due to accidental puncture of vein the redness and pain is occurring in arm. Because of inflammation of vein thrombophlebitis occurred. Thrombophlebitis causes pain, redness in affected area.
- first of all to relieve pain I would advise him to give him any good anti inflammatory drug like NSAIDs like ibuprofen. This will relieve pain as well as redness.
- For edema, redness apply ice over affected area.
- Thrombophobe cream applications will help in fast recovery.
- Heparin containing creams can be used if no relief occur and severity of pain increases.
- advise him to not to inject meth again in injured site because repeated trauma may lead to fibrosis in vein.

Hope I cleared your doubt, if you have more questions you can ask again in follow up.

Thanks
Dr. Sheikhoo Bishnoi, MD

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