Hi! I need som help with an avian patient with skinproblems. The patient is a 11

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Hi! I need som help with an avian patient with skinproblems. The patient is a 11 years old male cockatiel. He is eating pellets and has a UV-light. He first presented with loss of feathers over the cere, head and neck area. He had pruritus. The skin was inflammed, some of the feather follicles was dilated and had hard yellow exudate around them. Some of the feathers looked abnormal in shape and length. On cytologi there were lots of cocci and inflammatory cells. Parasites were not observed. He was treated with selamectin for parasites and I Sent in a sample for fungal and bacterial culture. Neative for fungus, but had a large amount of Staphylococcus intermedius. Was treated with antibiotics according to antibiogram and apparently recovered and the feathers grew out. Came back a month later with the same skin and feather changes. Cytology again showed low amount of cocci and also malassezia. Tried treatment with clotrimazol locally but he had an adverse reaction to it. Used F10 topically which improved the skin and feathers significally for a couple of weeks. He then came back again a couple of weeks ago with feather loss and dilated follickles in the neck area again. The feathers fall of easily and some look thickened and are shorter than normal. Still a lot of cocci and inflammatory cells on cytologi. Culture again showed high count of Staphylococcus intermedius. He is now on a longer course of antibiotics and has improved some, but not fully. On the last check up I also observed some other cells on cytology that I havent seen before (se picture), any idea what they might be? He is now self-mutilating a small area of both his wings and the owner has used a cone to prevent this. I have also tries aloe vera spray to soothe the skin. Have checked feces and crop samples for parasites etc. Havent done bloodwork so far (the owner is a bit reluctant). He was quite thin when he first presented, but is now within normal limits. Besides his skin problems he seems healthy. No other pathologies detected on clinical examination. Does anyone have any tips on what to do next or about anything else I can do regarding treatment? Possible differentials? I would love some imput See pictures below. The first one is from the first appointement, the last one is from how he is now