Stress causes the release of a hormone called cortisol. Giving rats daily injections of corticosterone (rat cortisol) for several weeks kills certain brain cells. Stressing the rats each day for the same amount of time has an identical effect.
As soon as possible after the burn or scald, ideally within 20 minutes, cool the area of the burn using cool or lukewarm water for 10 minutes to half an hour. Do not use ice, ice water, creams, greases or butter, which can cause further damage. Butter and oils actually retain heat rather than helping to remove it.
Healing Ingrown Toenail. I know that an injury towards the cuticle of the nail area takes about 9 months to grow all the way out on your big toe. As far as an ingrown nail, it has to be treated or partially removed before the healing starts. You will feel much better within a day or two, but still takes longer to heal correctly. Warm soaks in saltwater will help ease the pain and heal it faster. Tea Tree Oil is helpful too. It will act as a soothing antiseptic and keeps fungus under control.