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There is a pecking order. I have also seen some chickens reaching through the fence, even though I let them out.@ammyg that is most likely dry fowl pox which aart has explained. Here is an article to read:
https://the-chicken-chick.com/fowl-pox-prevention-treatmen/
To me @Coopscraft your hen looks to have either peck marks or damage from rubbing against wire fencing. Is she being pushed around or bullied by another chicken?