I have a crappy gp who I can’t get an appointment with for 4 days. I am feeling generally unwell cold/flu like symptoms. This is not unusual as I work with kids and my immune system crashes every half term. But for the past two days my face is bright red and blotchy and feels like I’m standing too close to a fire. Wondered if I might have slapped cheek? How do I know and what’s the best treatment?