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 on roof of mouth. Canker sores appear in the mouth as small ulcers on the inner cheeks surface, lips, tongue and on the roof of the mouth. They can cause difficulty in feeding and drinking in most patients. Canker sore and cold sore or fever blister are not the same.