Boils are folliculitis, and boils are more localized folliculitis, where the patient experiences significant redness, swelling, pain, and the onset of pus. To determine if the boil pus has drained, it is important to look at the external signs and symptoms. After the pus is drained, the redness and swelling of the localized boil can be quickly eliminated, the pain can be significantly relieved, and the hardness of the boil, which was relatively hard to the touch, can be significantly reduced after the pus is drained. After 1-2 days, the patient will experience a significant decrease in localized skin temperature, significant pain relief, and better healing. However, if the localized pus is not drained, the patient may experience continued aggravation of the localized boil infection. The root plate may continue to grow larger, the localized swelling and pain may increase significantly, and the skin temperature may rise further.