The appearance of bubbles with light content on the superficially damaged skin layer is characteristic. You can not open them. Wipe the skin gently with alcohol and apply a sterile dressing. Do not rub or massage the skin with the appearance of edema and blistering; in such cases, warming can be performed using a heat bath, the temperature of which should be gradually increased from 20 to 40 ± C over a period of 20-30 minutes. Usually after 10-12 days the bubbles dry up and, if a small area was affected, after two or three weeks, recovery occurs.