Pharmaceutical composition comprising an antiseptic Agent, antiseptic, an essential oil, a phenolic antiseptic Agent, an agent with anti-inflammatory and excipients, which is useful for the treatment of painful lesions of the oral mucosaInflammatory and ulcerative lesions of different Origins and \/ or the Prevention and Treatment of oral mucositis, stomatitis and particularly associated with anticancer TherapiesComposicion farmaceutica antiseptica que comprende un agente antiseptico, un aceite esencial, un agente antiseptico fenolico, un agente con propiedades antiinflamatorias y excipientes, la cual es util para el tratamiento de lesiones dolorosas de la mucosa oral, lesiones ulcerativas e inflamatorias de distintos origenes y el tratamiento y/o la prevencion de mucositis oral y estomatitis particularmente asociada a terapias anticancerigenas