What does "allergy stuff" here? Is it a medicine for allergy or things causing allergy?
Yes, that's correct. We can assume that "allergy stuff" is referring to his allergy medication, for him to use in case he has an allergic reaction to something. Ex: Did you put his allergy stuff in his bag? Ex: His allergy stuff and other meds are in his backpack. (Meds = medicine)
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