Red swelling rash

I’ve just noticed a red swollen patch on my affected breast. It looks like the breast lymphoedema rash, and I do have lymphoedema in that area which has been treated for the 3 years since surgery. Last week I went to the physio lymphoedema for massage and she said I had made steady progress and that I was almost at the end of her treatment. Now yesterday this 5 cent raised red patch, surrounded by the telltale orangepeel and blush for a 6cm diameter area. Any thoughts out there?