A quantum fermionic massless charged particle self-interacting with its own self-generated bosonic electromagnetic field is reanalyzed in the framework of the Fock multitime and Feynman proper time paradigms. The self-interaction phenomenon structure is studied within the method based on a suitably renormalized quantum Fock space. The fermionic charged particle mass spectrum is also discussed. K e y w o r d s: quantum fermionic field, charged particle self-interaction problem, quantum Maxwell electrodynamics, Fock space, Fock multitime approach, charged particle inertial mass problem, least action principle, Lagrangian formalism, Feynman proper time paradigm.