I'm 23, female, with a long history of getting canker sores from dry, crunchy, and/or fried foods. Lately (and thankfully), I haven't been getting any canker sores since I switched to Sensodyne foam toothpaste (well, maybe at least one a month). Unfortunately, a new problem has arisen - this red, dry, peeling rash around my mouth with bad, painful cracks on the sides of my mouth. I can't tell if this is a fungal infection of some sort or if it's from using Chapstick. In the past I've found it to be a combination of the overuse of Chapstick and dry, cold weather, but I'm starting to suspect it's my Chapstick. I've discontinued it for now and using Vaseline on the affected area. Am I on the right track?