The four types of skin are Normal, Dry, Oily and Sensitive.
Each type is defined by specific characteristics and are pretty easy to identify.
You experience patches of both oily and dry skin. This is common and best solved by multi-masking to address dry and oily areas. Wash your face with a lightweight and fragrance free face wash and moisturize with a light oil like Vitamin E or jojoba oil to keep dry areas moisturized. These oils are lightweight enough to not clog your pores.
Lucky you! You have nearly perfect skin. You have little to few imperfections, no severe sensitivities and small pores. To maintain this skin type, avoid over-doing it with the products and keep your routine simple.
You have small pores, but experience dull, rough, or sensitive patches. Your skin may feel tight at times and have little elasticity. Stay away from drying products like benzoyl peroxide and fragranced face lotions. Use products like Cetaphil or CeraVe, which are made for sensitive skin.
Your forehead shines bright like a diamond and it's okay because I have this skin type too. You have enlarged pores and are prone to blackheads and pimples. To combat these symptoms wash your face at least twice a day and use lightweight, unscented moisturizers.
Your skin is sensitive and delicate as a flower. You are easily irritated by almost any product and may experience dryness, redness, burning or itching. This is usually triggered by using products that are fragranced or are made with harsh ingredients. Try a brand like CeraVe or Cetaphil, they are fragrance free, lightweight and made specifically for sensitive skin.