Cold sore on top lip and inside nostril, sore gums and roof of mouth?

An outbreak. . Sounds like you have an outbreak of cold sores. They do come in numbers sometimes and the best thing do is go to your dentist or md and get a script for acyclovir. If you are prone to these outbreaks or even singular sores..Then have some of that drug on hand at all times.
Sounds viral. This sounds viral. Likely a herpetic outbreak, but could be something more serious. Other conditions like erythema multiforma might be cause. I suggest a visit to either your family doctor or your dentist to evaluate sooner rather than later.

Related Questions

A little part of roof of mouth feels sore. I don't see anything. Can I have a cold and it settled up there? My nose keeps running too.

Trauma. Most likely you have a scratch or burn from food. Typically hot liquids -coffee, soup, tomato sauce from pizza, etc. will cause a burn. Crusty bread, chips, pretzels, etc can cause a scratch.If any of this applies, then that is the likely cause.You may also have a herpetic lesion,especially if you have a cold (virus) and a history of herpes. Warm salt water rinses (1tsp/8oz) often help . Good luck. Read more...
"Pizza Palate" Pizza or other hot foods and liquids also can burn the roof of your mouth. If the soreness persist beyond one week, call your dentist. Read more...

Cold sore swelling on lip and gum. What can I use on this?

Cold sore . Your doctor can prescribe valtrex (valacyclovir). Brief supplementation w lysine 1, 000mg orally 3x a day at the onset, can also ^ healing. * for lip: melissa officinalis or lemon balm (cream) has been shown in european studies to help expedite healing of cold sores. Your dermatologist can also provide laser treatments. Read more...