That unknown rash

Know how to deal with unknown allergies

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A SUDDEN RASH for no known reason can pinpoint to an allergy.

But the cause often remains anonymous. Tests also usually do not reveal anything, and patients are left to try hit and trial on screening allergens. Dr DM Mahajan, senior consultant, dermatology, Indraprastha Apollo Hospitals, says: “Allergies that appear as sudden rashes and itching can have many hidden triggers. Common causes include food items (like nuts, dairy, shellfish), insect bites, medicines, dust, pollen, pet dander, or even certain soaps and detergents. Sometimes, the body reacts to temperature changes, stress, or infections, leading to skin rashes. When the exact reason is not clear, it is called an idiopathic allergy.

Because the immune system is highly sensitive, even harmless substances can trigger such reactions. Tracking when and where symptoms appear can help narrow down possible causes and avoid repeated exposure to triggers.”

How to diagnose unknown allergies?