can you be allergic to yourself? apparently yes

Look,he knows its not normal to always be coughing and sneezing and sniffling and having puffy eyes like you just cried,but tommy is also not really normal ,so he accepted this part of himself and never got it checked out, it never got to the point of actually having him get some sort of professional help so he just went "shit immune system ,am always sick , whatever time to steal" .orTommy is allergic to himself and other that soon became his family,but he doesn't know this until much later when he's forced to get an allergy patch test after he mentions his 'weak immune system' during a much needed check up.