your yellowish discoloration may have several causes the most common of which is viral hepatitis where there are several subclasses. Hep A is the most common transmitted through the oral-feacal route meaning you get the virus from the contaminated food and water that you take and excrete it through your feces. It is self limiting usually lasting for 2 weeks at the most. Since you get it from food or water, best thing is isolation and use of separate utensils until full recovery.