Well usually after being sick and they make a full recovery could be days to weeks depends how quickly meds were given. My blue heeler caught parvo and was on deaths doorstep and my vet saved his life was also told that parvo can be in the yard.

Could be a infected tear duct, sty or the onset of pink eye,

Don't know about alive but you can give it asprin but just in case call a vet to make sure good luck.

I just went thru this and the spot was a cyst but it could also be cancer your Dr. Could tell you which thru blood work etc..