A virus may be the cause if there is associated fu like symptoms, joint pains, pain in swallowing and eye redness.
Allergic reactions
to pollen, food, and dust should also be looked into. Dermatitis and heat rash are also differentials.
At this point, a complete medical history and physical examination are essential to get a diagnosis. If there is a strong family history of asthma and allergies, all the more that an initial consult is necessary.