In order to assist in evaluating/monitoring pain, and in treating same, a touch-sensitive graphics tool is provided with a local application (TGapps) for displaying a graphical representation of a patient's body, on which the patient can delimit a zone. A control application cooperates with the local application in order to record each delimited zone together with the corresponding surface data. The control application has a first mode in which the local application (TGapps) can be used by the patient to delimit zones of pain and a second mode in which the local application can be used by the patient to delimit treated zones. The tool is configured to activate graphical and/or numerical comparisons between the surface areas of the pain zones and the surface areas of the treated zones. In this way, it is possible to evaluate pain and the effects of treatment.
