In addressing whether the trial court properly applied the discovery rule to the defamation action, we are constrained by certain well-established rules of law. "`It is well established that an individual asserting a cause of action is required to use due diligence to properly inform himself or herself of the facts and circumstances upon which the claimed right of recovery is based and to institute suit within the applicable statute of limitations.'"
Hunsicker v. Connor, 318 Pa.Super. 418, 421, 465 A.2d 24, 26 (1983) (quoting
Petri v. Smith, 307 Pa.Super. 261, 268, 453 A.2d 342, 346 (1982)). "`[M]ere mistake, misunderstanding or lack of knowledge do not toll the running of the statute of limitations.' Although `we shall surely do equity whenever possible, ... we may not act in derogation of the express limitations enacted by our legislature.'"
Hunsicker, 318 Pa.Super. at 423, 465 A.2d at 27 (citation omitted). The discovery rule is an exception to these general rules. Under the discovery rule "... the statute of limitations does not begin to run `until the plaintiff has discovered his injury, or, in the exercise of reasonable diligence, should have discovered his injury.'"
Corbett v. Weisband, 380 Pa.Super. 292, 309, 551 A.2d 1059, 1068 (1988) (citation omitted). The discovery rule arises out of an "... inability of the injured, despite the exercise of due diligence, to know of the injury or its cause."
Pocono International Raceway v. Pocono Produce, 503 Pa. 80, 85, 468 A.2d 468, 471 (1983).
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