Bubble is nothing serious. Disinfect the bubbles with a needle, poke them open and squeeze out pus. Be sure to squeeze it out. You can cut a small hole in the dead skin so that pus won't stay in it. Pay attention to keep it dry and clean, and it will scab in two days. It's best not to handle a large area by yourself, it will be infected. It's safer to call a doctor in the clinic to handle it.