Verdigritis

Verdigritis is the name of a relatively rare genetic condition which renders a person unable to accrue potentia. The affliction is easily distinguishable by the green tinge it gives to a sufferer's skin. It is unknown where the condition originates from, or what causes it beyond genetics.

Development
There are sometimes those who are born to magicool families, who are lacking the gift to wield potentia adequately. Either they possess no innate potentia and (as any mortal) must rely upon the good graces of deities before their skills improve, or more rarely are born with a condition known as verdigritis, which is a genetic condition that prevents potentia from accruing within the body's systems.

Perception
Verdigritis is still considered a stigma within magical families today. Sufferers often find themselves shunned by the more archaic members of the magical community who consider verdigritis shameful and are often repulsed by the victim's skin. There has been little success in changing perceptions of this disease, with many suffering in silence, their green skins hidden away behind a glamour cast by a well-meaning friend.

Cure
There is currently no known cure for verdigritis beyond acceptance of a life without magic. The green hue of the skin can easily be disguised with cosmetics, treatments or glamours.

This is not to say a cure could never be found as presently there are two persons known to have been cured of verdigritis. One being Elpha Vaher, who had that aspect of her reality altered by a Djinn, and the other being the supervillainess Toxic Kudzu. Kudzu was a normal mortal (Tamara Kudhew) until being struck by a stray bolt of potentia that gave her verdigritis, yet allowed her to tap into and control the mystical energies of flora in her vicinity. Despite having evident magical power her skin retained its green colouring.

The very notion that these two persons have been cured of the affliction proves that it can be done, however a way that is easily repeatable has not yet been found as research into a cure is intermittent at best.