Dermatology Questions? Ask an Online Dermatologist.
try to use over-the-counter hydrocortisone cream and take anti-histamine oral medication like Zyrtec, Allegra.
If it is allergy, it would be gone within a week. But if you are exposed to the allergen, you would get it again. You should think what the allergen is and avoid it. If it is not improved in a week, you should see a dermatologist to have it examined.