At 21 days with no blisters, and having symptoms only in the corners of your mouth, I'd go with angular cheilitis. It may resolve on it's own, but if it gets worse, see your doctor.
I wouldn't worry about herpes at this point.
It could also be an allergy to something. Have you started using anything new, like new toothpaste, mouthwash, lip balm, etc.? Started eating anything new, or more of something you've eaten before?
Now I have ONLY at the corners of both corners of my mouth 2 very small bump and redness and wonder if I could have a minor case angular cheilitis? No bumps / blisters anywhere else just at my corners. Thoughts? Thanks