My 1 year old house rabbit lost about a dime size of hair on back. On closer inspection there is a red wealt where the new hair has not started growing yet. When he was three months old similar thing but a lot smaller and I took him to the vet and they said it was just dry skin no pests in fur and cost me a lot of money to be told that. Is it common for Lops to develop dry skin over the winter months. He’s in a large open pen. No other pets. Has free roam every day while supervised. Any advice would be be appreciated. He is still social and a happy bunny !