I used to feel a bit tender over the vein. However if it hasn't healed at the entry point it's imperitive you have it checked out. The area may have tissued and chemo leaked into the skin or it could be an infection. Both need a medical check. The entry point should be healed by 7 days I would think. Even if all turns out okay it's better than leaving a potential infection there as by day 10 your white cell count will drop and ability to fight infection is greatly reduced. I don't want to scare you ...but if in doubt check it out.
Chemo is toxic, that's how it works. But the dangers are when people ignore side effects out of the norm and seek assistance too late. Never be embarrassed being told it's nothing to worry about.
Kath x