The next step is desensitization. Desensitization therapy is a kind of allergy treatment method that needs to be adhered to for a long time, and it is helpful in the treatment of allergic rhinitis caused by pollen and other factors. Sublingual desensitization therapy is usually two years, and hypodermic desensitization therapy is at least three years. Subcutaneous desensitization is done once a week for the first six months, then once every two weeks to once a month at the end of the year, otherwise it can be a lost cause or take longer to treat.
To cure allergies, you need to find the trigger, and usually pollen allergy is not just an allergic reaction to a particular substance; there are about 3,000 common pollens, and it's very difficult to pinpoint the causative agent.