I've had banana peppers that were hard and they were fine (can't remember if they had black spots or not) but I noticed they were hard because they'd sat out of their juice for a while, I'd bet thats all it was w/ yours. And like jk said they are kept in so much vinegar it'd be really hard for something nasty to grow on it. Hope you feel better soon!
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Johann Wolfgang von Goethe
\"Do not anticipate trouble, or worry about what may never happen. Keep in the sunlight.\"
Benjamin Franklin