Sore and tender, but not red, inflamed, or oozing, is usually just irritation.. at least for my piercings and injection sites (long term pain management). Scars, when healing, often go through many cycles of being painful, and that can last years; as long as the scar is still visible. This happens because your body is trying to make better repairs -scar tissue is intended to be temporary; just something to fill the wound so it doesn't get infected, until such time as proper repairs can be made. That means increased blood flow, which always makes things more sensitive, killing off of cells no longer needed, some of which may have nerve endings, and of course the normal healing process, which is never comfortable :p
If you get scratched again, cleaning with H2O2 is always a good idea. If the cut starts getting infected (red, excessively painful, swollen, and/or oozing), and you catch it when it's just starting, a mix of H2O2, isopropyl alcohol, sea salt, and antibacterial soap applied as a warm soak does wonders. Hydrogen peroxide ruptures cells, kills basically everything, and dries out the wound to help stop oozing; rubbing alcohol and antibacterial soap also help kill things in the wound; sea salt dries the tissue and any remaining bacteria, plus deposits minerals useful for healing.
I've been using this mix for years (a concoction I hit upon because I bite my cuticles until they are red, bloody, and swollen), and it works like a charm. It may also help with the discomfort of irritation, even if there's no infection, by drying out the tissue. Probably won't help with scar pain, but a warm compress might.
Edit- you might also want to try putting coconut oil on the scar, as this can help with cell repair and cut down on any itching the healing might cause.
Last edited by Monkeybuttorama; 08-19-2015 at 08:37 AM.
Reason: Adding info