medical advice on bile

Dear friends, I have a puzzle here on bile, pitta, in the Co to the Sivaka
Sutta. Dear Suan, I would appreciate your advice, but please do not answer
if you have no time. I know you are busy.
The difficulty is the following:
lokopi hissa sariire sabalava.n.nataadipittavikaara.m disvaa ``pittamassa
kupita''nti jaanaati.
The words sabalava.n.nataadipittavikaara.m, va.n.na is colour or appearance,
sabala: bala is force , with force. Also (common) people (in the world) when
they have seen in his body a change of appearance of the bile that is
swollen(?) they know that his bile is disturbed.
Can someone else see the bile? Only feel it when it is swollen? Num would
also know this?
Thanks for any advice, Nina.