My toddler bit me yesterday on my upper arm and broke the skin. Should I seek treatment? I am embarrassed about this however I am wondering if there is a chance of infection.

There is always a high risk of infection associated with bites as mouths of mammals tend to carry a high number of bacteria.  Human bites are no exception. The major concern with human bites is also the chance of infectious diseases transmitted through the bite, but if your son is a toddler this risk would be low.  That being said, however, you should follow up with your physician for a thorough assessment and cleaning of your wound.