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Well most bed sores come from extended period of time in one position. At elast 48 hours in one spot. With out moving. Errmm It depends how heavy you are, how clean you and the bed is and if you're going to vary positions....I'd say about 2 weeks, so good luck with that! Don't worry. You'll probably pass out through thirst/hunger before the bed sores set in, so you won't even notice them!
If the sore has already erupted and is beginning to scab, use an over-the-counter medication like Abreva to help ease symptoms and reduce redness. Cold sores typically last 7 to 10 days, so it all depends on how early you catch and treat it, says Dr. Welsh. Cold sores are caused by the herpes simplex 1 virus and don't pop up unless something triggers them -- usually stress or overexposure to the sun.