Hi,Dear,Good Morning and Thanks for your query to my virtual Clinic At HCM.
I studied your query in depth and understood your concerns .
Causes for lump under armpit area with pregnancy- as follows-
Mostly they are boil with died out infection with
cellulitis still.
Check with ER Surgeon to resolve the worry.
Don't worry of them,as they could be relieved with proper treatment.
Hope above reply would help you to relieve of the issue you have.
Welcome for any further query to ME and HCM.
Wishing you a Fast Recovery.
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With Regards
Dr.Savaskar