Sensitive skin has a low toleration level to certain products or environmental conditions.
Have a good diet which should include plenty of leafy green vegetables and fruits. Henna or mehandi is an easiest way to keep a cool head. 
Most professionals say eating a controlled diet is the only way to get your cut of good food for good skin.
Over-active glands cause oily skin, which produce too much sebum. Sebaceous glands produced the sebum. It's required as it helps lubricate your skin and carries away dead skin cells. Too much sebum is being produced when the skin is oily. The skin becomes lifeless and oily and pores may become clogged.
The additional secretion of sebum can be due to many factors.
