Numerous methods have been applied from olden days to the treatment of uterine cervix erosions, and among these methods the one that gives a relatively good result and it still extensively used is the cauterization of the uterine cervix. But we have only a few reports dealing with the healing process after the cauterization as viewed from histological findings. It naturally follows that no interpretation has been attempted to the problem whether the healing process after cauterization takes an identical course as spontaneous healing. I have some doubt about the theory that the healing of prendo-erorion of the uterine cerrix take place, and as a step toward the elucidation of the problems attempts were made to compare histological findings of the healing process after cauterization with those of spontaneous healing. It has been shown that spontaneous healing of pseudo-erosion takes an identical course as the healing after cauterization. In other words, pseudo-erosion without accompaniment of inflammation is considerd to be not a pathological state as such the boundary line of the erosion does not generally migrate. However, if the erosion is complicated with inflammation witch is a pathotogic condition, the columuar epithelium with a weak resistance is cast off and there is formed true erosions, but it seems that along with recession of inflammation the granulative tissue formation is enhanced and its boundary becomes migratory, moving as it were from, the side of the squamous epithelium. In separate portions these, processes repeatedly proceed and finally the epidermization of the squamous epithelium over the entire area of the erosion is completed.