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 It may help to remember that canker sores occur inside the mouth, while cold sores usually occur outside the mouth. 2  Canker sores can recur, and can be minor (small), major (larger) or herpetiform (multiple, in groups or clusters).3  Canker sores are common and often recur. Symptoms include white spots inside the mouth or on the tongue, sore throat and difficulty swallowing. 2  Canker sores â these are small white or yellow center lesions with a red border. 3  They develop in the mouth on the tongue, inside cheek areas, lips, gum line and throat area. 4  They are not contagious.