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.
Canker sores (Aphthous ulcers) Canker sores are not a form of herpes, however, they are often confused and mistaken as herpes. Canker sores are not considered to be contagious. Cold sores and mouth herpes on the other hand are caused by the herpes simplex virus and can be very contagious. Canker sores usually occur inside the mouth, are gray in color and have a distinct edge. The sores will usually heal within 10 to 14 days, without treatment.