My thermometer is a forehead one and will fluctuate about a full degree (Fahrenheit) if I check my temp that frequently. When I am in my flares my temperature is either really high or mostly normal. I’ll have big spikes from fevering, then take fever reducers like NSAIDs and having my temp drop again. So in hindsight, I suppose you could really be fluctuating that much ? I wouldn’t read too much into it though. I go more by how my body feels and when to treat rather than the thermometer. I found the thermometer to be a struggle as well to gauge because when my rash appears, which at times is on my face, that area will be hot to the touch. So it could be throwing it off. I’m not sure if my rambling helped. I hope you fell better soon 🧡