conservative wedding garment for over size ladies

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THIS ONE PLEASE.. May I please have an urgent private post?
My husband has just discovered a very hard pea sized lump in his armpit. It doesnt move and feels like it's attached to the tissue rather than under the skin. I'm worried his quite panicked.. has anybody got any experience with this??? Will go to the gp on Monday if possible as his not registered.. it's not a bump just under the skin its deep. It's not visible and there's no redness or discolouration to the skin and not painful.. it feels like a hard mass conservative wedding garment for over size ladies

Kelly