i have no way of making a comment on your husband's fidelity but i can tell you that molluscum lesions can be contracted in other ways by direct skin-to-skin contact. it does not have to be sexual contact. i see these quite often in school-age children most likely acquired by one of their playmates. you could have contracted them from one of your patients.
i am a female paramedic and i contracted molluscum my husband of 5 years does not show symptoms. did he cheat. dermatologist diagnosed me with "molluscum contagiosum" i read up on it and as far as i understand if the first polyps show in genital area it is considered as a std. i have not been with anyone but my husband since april 2009. my husband does not show any symptoms. as long as i know him he has has some bumbs on his hand which he states he must have had those for at least 15 years. (those bumbs sometimes are very vidible and other times hardly noticable) my husband states he did not cheat.