Gemini rules the 3rd house in the natural zodiac. Gemini ruled body parts are hands, fingers, arms, shoulders, upper ribs, lungs, bronchial tracts, trachea, thymus gland, nerves and nervous system.
I think 2nd house rules lips/mouth.
Yeah I know but since Gemini also rules Communication, don't you Think it could have some Connection to the mouth as well? For example; Taurus rules throat and neck, but for instance Venus in Taurus often gives a stout, full Beautiful body.