Whitehead pimples have usually been around for a few days, and they have a white tip where pus has collected underneath the skin. These pimples are easy to pop, and when treated with care they can be safely removed without spreading the infection or causing scarring. Pimples that have just appeared in the past day or two aren't ready to pop yet. Wait until the whitehead appears at the tip of the blemish. This could worsen your pimple by sending bacteria deeper into your skin. Popping a pimple this big will almost definitely lead to a scar. Only a pimple with white pus is ready to pop. Dermatologists can determine the best way to treat your acne. They can prescribe creams that will eliminate your pimples. There are also several procedures they can perform that can treat severe breakouts.  The most commonly prescribed dermatologist treatment is a topical cream, rubbed on the pimples, that will remove oil from the skin and kill acne-causing bacteria. For red, swollen pimples an oral antibiotic, hormonal birth control, or isotretinoin might be prescribed.  Large acne cysts can be removed by dermatologists through drainage and extraction, in which they remove the cyst and drain out the pus. Your dermatologist can safely lance the pimple with a pin. This is a technique that should only be done by professionals. Laser therapies and chemical peels can treat the underlying causes of acne, although they will not remove current cysts. Pimples are caused by sweat sitting on your face. Anytime you sweat, wash your face gently with lukewarm water to remove dirt and grime. Do not be harsh or scrub, just wash off sweat.  Scrubbing roughly can worsen acne. Do not use rough cleaners, like astringents, toners, or exfoliants.

How would you rephrase that briefly using Vietnamese?
Nặn mụn đầu trắng. Không nặn mụn mới. Không nặn mụn lớn, đỏ hoặc đau. Đi khám bác sĩ da liễu. Ngăn ngừa mụn bằng cách rửa mặt thường xuyên.