Overstrecthing, working to hard, and stuff like that you can look it up and there are probably more reasons.
A cold sore is caused by a virus.
A cold sore is caused by the herpes simplex virus and will generally clear up in time. I did have one student in my classroom who kept picking at a cold sore and now has a scar in that area.
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Aching is a 6 letter word that describes sore muscles.
Lactic acid settling in the muscles
little
No
Sore muscles are a sign you are over doing it. You should take it easy if you are just starting out, if not let your muscles gradually work out to getting what it is you wish to reach.
One could ease sore muscles by soaking in a nice hot bath, one could even add Radox for that extra relaxation which helps sooth sore muscles. Also one could try Heat Wraps.
Continuing to work those sore muscles is what you shouldn't do. By continuing to workout, you put too much pressure on the muscles and instead of being strengthen, you tire them and they will rip therefore you'll have to see a doctor and you can't exercise for 1-2 months. And when your muscles are sore, give them days of rest until they aren't sore anymore, eating food will determine the energy for the sore muscles, and stretch them to make the pain go away.
because you are tearing them when you work them out.
Fermentation