Squeezing out white rice grains from a pimple is considered to be a normal sebaceous gland secretion, but blackheads and pimples cannot be ruled out. 1. Sebaceous gland secretion: sebaceous gland secretion is composed of sebum as well as epithelial cells shed by hair follicle skin, if these secretions in the pimples inside a relatively short period of time, when squeezed out, it is yellowish-white, similar to tofu dregs-like things. If the time is relatively long, gradually extrusion and condensation, extrusion is white rice-like objects. 2. Blackhead acne: There are openings on the surface of acne, which will form oxidation, and the tip will turn black. It is recommended that patients with acne should not squeeze the acne by themselves, so as not to cause bacteria or germs from the hand to enter the skin and cause infection.