Pimples are generally known medically as acne, and the white grains in acne are mostly considered to be pimples formed by the accumulation of sebum and keratin plugs at the mouth of hair follicles.
Acne is a chronic inflammation of the sebaceous glands of the hair follicles and has a number of causes, which may be related to endocrine, hereditary, and poor lifestyle habits. Often, the white grains in acne may be a mixture of sebum and keratin.
Acne mainly appears as corn-sized, flat or slightly raised pimples, which are often categorized as whiteheads and blackheads. Whiteheads extrude a white, tofu-like substance that may contain a mixture of bacteria and sebum; blackheads appear as black pimples that may be squeezed to produce a yellow, translucent substance.
White particles in acne are mostly pimples. It is recommended to consult a doctor at a regular hospital to learn about the matter and follow the doctor’s instructions for medication.