So I created this thing called 'eye clusters', which makes a human or animal start to develop eyes on random parts of its body. The eyes can't see or blink. Would something like this be possible(maybe without the use of magic)? I was thinking that whatever makes up the eye begins to form in wounds or pores of a creatures flesh? Also, could infected animals transfer the disease by biting or being bitten?
Here you go.
I found this image on reddit, but here is an article describing how these flies come to have eyes growing all over them.
Organisms have "homeotic" genes which kick off the development of organs. If you cause expression of one of these genes at a site, it kicks off development of the organ at that site. This fly had the gene to kick off eye development plugged in next to the one to kick off leg development - so eyes for legs.
From http://www.bbc.co.uk/news/science-environment-17062091. This is the least horrific of the images "Tasmanian devil cancer" gave me. It is a contagious cancer. Tasmanian devils fight and bite each other, of course, and they are immunologically so close to one another that cancer cells dislodged from one can take root in the wounds of another and grow.
If you had a cancer cell that expressed the eye initiation gene, the cancer would make an eye instead of a worthless tumor. If you had a contagious cancer like the devils, or a virally driven cancer (like cervical cancer) it could be transmissible. Crazy, but not magic crazy.
Yes. The Ophiocordyceps unilateralis is a fungus. It takes over the brain functions of its host, leading it to its inevitable death. While doing so it creates spiny growths on the body.
Another is Green-banded broodsac. Broodsacs are parasites that take over the eyes of their host. They tend to flash brightly, attracting the attention of the natural predators of their host. They wish to be eaten so they can get into the larger predator.
Either changes the look of their hosts. I guess eye like growths are possible. Perhaps it's to attracts the attention of other animals or scare them away. Maybe the main predator refuses to attack within sight. Thus growing fake eyes reduces the chance of attack of their host.