I agree with Jeff's comments. Hydrogen peroxides one advantage is that debrides (cleans) the wound. Yes, it probably slows healing some, and may make the scar marginally more prominent. If I didn't have adequate, appropriate flush solution at hand, but did have peroxide, I'd use without a second thought. Wound cleansing, both initial and ongoing, is the most important part of preventing infection. Once infection starts, you'll probably need oral or possibly IV antibiotics. MRSA is now a disease of civilization, not just healthcare facilities, but in the community. In the wild MRSA would be unlikely, but not impossible, “civilization” seems to touch almost everywhere.