Erh GP wasn't much help just inspected it and said oh no real sign of infection maybe just rest it a few days. WTAF?! Yeh stop feeding on that boob because that will help!! Anyway spoke to chemist who agreed with me it sounds suspicious as it came on so suddenly and suggested Canesten cream for a few days so I will try that and hope it clears. At least no signs of mastitis. And no thrush visible in DS2s mouth either.