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Is your left hand puffy at all?
Herceptin can cause swelling of hands and feet and, considering the extensive axillary surgery you had with your mastectomy (looked at your profile) your right arm might not have as good of drainage of either venous blood or lymph
making it be more affected than the right side.
As Becky said, hot weather can cause swelling, even in those who haven't had the surgery you have.
If you are still concerned, take a coolish bath and immerse the arm. As water pressure is greater than atmospheric pressure, it will act like an elastic sleeve (or better). If it improves the situation, it will not differentiate between swelling from heat vs lymphedema, as you will have cooled yourself down (and hopefully destressed!)
Hope this helped!
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