
What Causes Swelling In Underarm And Itchiness On Chest And Neck?

Can be due to allergy.
Detailed Answer:
Hello,
Thanks for posting your query.
The increase in size of the left arm with a burning sensation can be due to a swelling under the arm like lymphadenopathy or a mild nerve root compression at the level of cervical spine. You can self examine the area for any palpable lumps.
The itching can be due to a local allergic reaction. You can start with oral Benadryl available over the counter and avoid using a pillow and see if it helps.
In case the symptoms are persistent then do consult your physician for a direct examination to find out the cause.
I hope this answers your query.
In case you have additional questions or doubts, you can forward them to me, and I shall be glad to help you out.
Wishing you good health.
Regards.
Dr. Praveen Tayal.
For future query, you can directly approach me through my profile URL http://bit.ly/Dr-Praveen-Tayal

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