This symptom may actually be due to a white strip around the hair follicle that is discharged from the skin surface by squeezing it with the hand. The contents are gradually discharged from the body after squeezing. Most of the white strips are found on the face or the front or back, which are densely distributed areas of sebaceous glands, so if you eat spicy, stimulating foods and stay up too late, this symptom may be aggravated.