There are usually two locations on the face known as the triangle, respectively the inverted triangle of the T-zone, and the positive triangle of the dangerous triangle: 1, T-zone: mainly refers to the forehead and both sides of the eyebrow rib bone to form a long line, plus the bridge of the nose to form the downward area, the overall inverted triangle. Because the shape is very much like a capital T, so also known as the T zone. Because of the large number of sebaceous glands and sweat glands in this area, it is easy to get oily and form seborrhea, which can lead to seborrhea or acne. Therefore, you should do a good job of cleaning every day to prevent inflammation. You can choose a refreshing, balanced and foamy cleanser, but do not clean multiple times a day to avoid over-cleaning; 2. Dangerous triangle: usually refers to the triangular area formed by the line from the corner of the mouth to the root of the nose on both sides, with an overall positive triangle shape. This area is a dangerous area, rich in blood vessels, and most importantly, this area has more blood vessels leading to the brain. If boils or pustules are squeezed in the dangerous triangle, a large amount of bacterial pus may be transmitted to the brain and meningitis or brain abscess may occur. Therefore, it is important to note that pus spots in the danger triangle of the face should not be scratched, squeezed or pricked.