In stochastic processes, chaos theory and time series analysis, detrended fluctuation analysis (DFA) is a method for determining the statistical self-affinity of a signal.
Sore throats caused by tonsillitis or streptococcus may trigger a canker sore even after the initial throat condition has subsided. Also known as an aphthous ulcer, canker sores are painful and unsightly, but they are not contagious.
1. Canker Sores. Canker sores are painful white ulcers in the mouth surrounded by an area of redness. They appear most often on the inside the cheeks, inside the lips, and your tongue. Canker sores are different from cold sores, which are caused by the contagious herpes virus, and canker sores are not contagious.