Thank you LaFleche and Marla.
I am happy that I'll soon not need to dress Fatty's foot. I think she should be fine soon. This is what it looked like yesterday.
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On taking the dressing off Hazel's leg, her scales came away and were very crumbly. I have been treating her for scaly leg mite and assume that this is the old scales breaking off and are only noticed because they are trapped in the dressing. The leg looks nice and pink where the scales have gone. I hope this is ok. Here are some pictures.
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The following are photos of her scab and after its removal. I can't see any sign of infection like there was in Fatty's foot. There is a fairly hard part of the wound (circled on the photo) but it is not the same sort of fibrous material that was in Fatty's wound. Also as I tried to carefully pull bits away, there was some blood so I stopped immediately and sprayed and dressed it. I think I'll just clean and dress it from now on. There is no swelling or any signs of redness. Hopefully she will be ok.
Photos of Hazel's foot:
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On another note, they have a gentle ramp out of the coop down into the run so never jump down. The perches in the coop are about 18" to the wooden floor with straw bedding on it. The only thing I have noticed, after the mention of stones etc in the run, are quite a few stones in the back section which I have started collecting. I will get them all out and add sand to the loose soil in that section as I have done for the front section to provide them with a nice soft surface in the run.
I do doubt if they injured themselves in the run though and probably cut themselves on hawthorn or brambles.
Re straw bedding: I check for mites several times a week (I have double sided tape round the perches to keep a check and check on the nooks and crannies) and the straw is split or crushed so does not have hollow sections and is treated with disinfectant as it is specifically for chicken bedding.
I think that is enough of my rambling for one post so thank you very much again for all the guidance and reassurance.
Richard.