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Yes that is cause for concern...
Take Benadryl 50 mg now and get to ER ASAP...
Swelling of tongue sounds that you probably have angioedema ...this may affect tongue, lips, airway can become compromised ( other areas of swelling possible)
Due to bad potential you need medical attention without delay..
I hope that this is helpful.Let me know if you have further questions or concerns.If my answers have been helpful and to your satisfaction then please remember to leave positive feedback.Thank you and Best Regards!!
Anthony Bray MD
Angioedema is allergic type reaction. Severity and extent may vary...