Jay Spearing was rushed to hospital on Saturday after being diagnosed with a rare disorder.
He made 55 appearances for the Reds between 2008 and 2013).
There are about 300 new cases of the disease in the UK each year.
"Don't ignore changes in your body, no matter how small, get them checked out!" he wrote on Instagram.
Blood tests by Liverpool's medical department revealed he was close to falling into adrenal crisis, a potentially fatal condition caused by a drop in the cortisol hormone.
It took me a while to get my head around it, but I am thankful that it can be managed with hormones.
I won't allow it to affect or dictate my life.
I've been ignoring symptoms and changes in my body for over a year.
Areas of dark skin can be caused by the lack of hormones in the adrenals on top of your kidneys.
The National Health Service says symptoms can "largely be controlled".
It says that most people with the condition have a normal lifespan and are able to live an active life.
Spearing has been registered as an over-age player for the club's under-21 side in order to help the development of its elite prospects.
Along with club captain and former team-mates Jordan Henderson and Tyler Morton, they wished him well.
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