As Neils Bohr showed, it is possible for electrons to move between energy levels. Light contains energy. If a photon of light strikes an atom, it is possible for the energy in the light ray to be transferred to one of the low energy electrons moving around the atomic center.
Spotting before a period is due â reasons for spotting before a period can be implantation, from a cyst or a short luteal phase and impaired egg quality. Spotting in between cycles â this is a difficult term to answer but often means your cycles are growing shorter; often with perimenopause.
If your spotting has nothing to do with the menstrual cycle, then it may be caused by implantation bleeding. This condition occurs about a week before the menstrual period, and looks like mild or light spotting. It is caused by the attachment of the fertilized egg to the endometrium or uterus wall.