I am suffering allergy~!!!

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It is the beginning of Spring,the atmosphere here is much dry here,and the skin does not feel good.The day before yesterday,i was woke up by the itch of my neck ,and I have scratched the skin of that area by the light of nature.All the neck became red,full of pimples,it feels terrible . I went to the hospital ,and the doctor told me just as i supposed it was allergy,I must have had smelt or touched sth which i was allergic to,and the doctor can not sure what it is the cause of allergy. I took some pills ,and now it seems better ,though the red ones are still exist. Have you ever sufferred this kind of thing??Or do you know what you are allergic to?Flower?Dust? or sth else??