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I started seeing ticks in February this year. You could dip a cotton ball in rubbing alcohol and place it on it. Won't do it any harm if it's a skin tag or growth but will make the tick release if it is one. If it turns out to be a growth I'd just keep an eye on it for changes in size, texture, or color. If it's not causing discomfort I'd leave it alone. If you see any changes you could take her to an avian vet or research and make a decision on how to proceed. Good luck and best wishes.