Can one develop a allergy to something they've never been alergic to in the past?
All my life i've never had a problem with this. Im alergic to ~90% of the deodorants out their now. I even get a rash from deodorants I used in the past...
Enough exposure of something your body finds as forgein will cause an allergic reaction of some kind. If you are moderatley sensitive to something you may not notice a reaction but after continual exposure antibody levels tend to rise and eventually you may become "allergic".
yes, i have had no alergies ever until i hit 19 and developed a nesel alergy. the doctors can refer you to the hospital to do tests to check the exact chemical that causes the issue.some doctores are more forthcoming with referals than others