Blue Lips

I've just been informed that my lips turn blue when my blood pressure drops. I wasn't aware of this. Apparently Rambo's noticed them turn blue before but didn't realise what was causing it until I was dizzy in the park just now and he forced me to sit down, then watched the colour come back into them as my bp normalised. He's actually quite pleased to have an outward indicator of how I'm doing - normally he has to rely on trying to work out if my brain fogginess and irritability means I'm low on spoons or just not awake yet/actually mad at him. :P