I am also puzzled about leg/ foot feather situations on my chickens.
I can't figure out why on earth chickens grow those, they are so troublesome !
My first issue is that my rooster Theo's leg feathers almost all start as ingrown. They always raise his scales and some turn into small hard balls that look very irritated before finally coming out. This year it's getting quite bad. I've tried pulling a feather out two or three times and it just seemed to make things worse - the feather grows back and makes an even bigger ball. I've also tried coating vaseline for a few weeks and it doesn't seem to help.
Not a good picture but we're not on friendly terms these days.
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My second issue is with my hen Léa. It's her third winter, and two of her leg feathers are growing so long this molt that she actually steps on them with her other foot ! Also hesitant to trim them or just let her be.
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I have an anecdote relating to shingles I've been hesitant to share for a while. It's more a curious tale, definitely not meant to be taking seriously, so just skip it if superstition irritates you.
A few years ago my partner woke up a sunday looking like elephant man. His eyes and upper head swollen huge, a 40° fever, and terrible pain. He was supposed to work that night driving the tram in Nice. He did not feel up to it (which is totally unlike him and made me worried more than his looks). He went to the ER to know what was going on and the young intern on guard said it was just conjunctivitis and gave him eye drop and a two day off work leave.
Two days later things were getting even worse and he still did not feel up to working. He went to see his family doctor, who immediately recognized a zona and sent him straight to an ophthalmologist friend of his. He got antivirals and started taking them on wednesday.
In the mean time however, his father had freaked out seeing his face and was exhorting him to go see what we call a "magnetizer" : in old folk's lore, people who are supposed to have a special talent, one kind of which is to "take out the fire" in people, meaning cure things like warts and zona. My partner is really not open to any kind of alternative medicine, let alone something like witchcraft

, so it was another sign that he felt desperate when he agreed to go. The man his father knew had retired, and sent him to his friend, who was a two hours drive away : a friend of ours took my partner there wednesday morning and the guy did his magic thing.
Coming home my partner wasn't sure at all if anything had happened, he just felt some kind of heat.
Anyway the next day he took a turn around and things began getting much better. It was another ten days before he was completely cured and feeling himself again.
I'm convinced that either the antiviral were really efficient or that his immune system was able to fight it off after the first days. But strangely my partner is absolutely firm that it was the magnetising thing that did it. He still doesn't believe in alternative treatments and swears by modern medicine but just for that one thing, he is convinced that the magical thing cured him

. I personally think he was so unused to that degree of pain, to not being able to handle a health issue by acting like it was just a temporary minor problem, that it just made him open to believing anything irrational. And I'm rather open to natural alternative treatments that don't necessarily have a scientific explanation yet.
But.. who knows.
That magnétiseur has been so much in demand that he has left his full time job as a commercial a few years ago and now he makes a living of his supposed gift.