This is pretty simple. My roommate at college gets all kinds of dryness problems in the winter (bloody nose, dry skin, lips, etc...). I have pretty bad dust allergies--I take two kinds of prescription medication every day for it year round. He just bought a humidifier for the winter. The problem is, I know that having a humidifier on in our room would be bad for my allergies. Dust mites thrive in humid conditions. In fact, I used to use a de-humidifier at home for this very reason. I just feel conflicted about telling him he has to suffer a winter of dryness for the sake of my allergies. It's a situation where one of us will end up being uncomfortable. We get along great; we chose to live together. Either of us would feel guilty about putting the other in the unfavorable position.
My question: Is there anything I can recommend to my roommate for his dryness that won't affect me in the room? How can we best solve this problem fairly?