Can I use hydrogen peroxide to clean an open wound under my breast?

If your wound is the result of recent surgery, I recommend asking your surgeon for wound care instructions. In general I do not reccomend using hydrogen peroxide on wounds. It kills bacteria, but it also kills healthy cells, which slows wound healing.

Often local wound care with wet to dry dressings seem to do the best.  But each doctor is different, best to ask your surgeon.