There seems to be nothing to worry about.As the viral illness will go on its own and the red lines can be because of the infection which will get settled down once the infection is over or it could be because of the reflux disease.The acid reflux
from the stomach irritates the throat and because of constant and long term ie chronic irritation the red lines may appear and yellow spot may too appear .
You can do gargle with diluted betadine
to maintain the oral hygiene
.You can also take anti reflux medicines
In doubt do reply