உருட்டு Series | Hair Dye உருட்டு | Dr S Murugusundram 

Delayed hypersensitivity reactions can cause allergies even after years. Dr S Murugusundram advises a PATCH TEST to identify the cause. Mix hair color + developer, apply to skin for 72 hours to detect allergies. Remember, late reactions take time to heal. Stay aware, stay safe.
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