Closed acne, also known as white-headed acne, is yellow-white spots or small papules in appearance. Closed acne is difficult to cure clinically. The reason of closed acne is that the stratum corneum is too thick. Closed acne belongs to unstable acne (closed acne), which is easy to evolve into blisters. Acne is divided into closed acne and blackhead acne. Most of the causes of closed acne on the face may be due to poor detoxification of the body, leading to endocrine disorders.

Closed acne is characterized by a hemispherical white packet the size of a rice grain, which is hard and has no conscious symptoms.