I've been straight razor shaving since January. Usually I've been impeccable about rust prevention, applying mineral oil once a week and always making sure the blade and scales are dry before closing (usually I leave it open for a day just to make sure no moisture gets trapped against the blade).

However, I slipped up. I'm guessing I closed the blade on some water because there's a rust mark about the size of an uncooked rice grain toward the end of the blade and close to the cutting edge. The orange-ish stuff rubbed right off with my finger, but there's still a darkened tarnish-like stain underneath. Is it possible to fix this? Should I worry about it spreading? What should I do for damage control?

(Also...can if get lockjaw I cut myself now?)

Thank you for any advice you can offer.