People have different skin types that can be divided into five categories: oily skin, dry skin, normal skin, sensitive skin and combination skin, which is the most common. Having combination skin means that your face most likely has an oily zone that includes your forehead, nose, and chin, while the rest of your skin has normal to dry patches.
If you were to draw a line through these areas, it would look like the letter "T" — hence, the commonly used beauty term, the T-Zone. The T-Zone is oilier than the rest of your face because it has a higher percentage of oil glands. These areas tend to break out more often and have a higher tendency toward blackheads, whiteheads, irritation, sunburn, and redness.
Caring for your T-Zone is easy: Just remember to keep your hands away from your face, and use a toner or astringent in addition to your cleanser to help keep the area clean.