Acne is caused by an infection of Propionibacterium acnes, and it is somewhat related to the overactive secretion of sebaceous glands. It predominantly occurs during adolescence, but some individuals may continue to experience symptoms into their 30s or even beyond 40 years of age. It is also related to personal diet habits, such as consuming spicy and irritating foods, or frequently staying up late. In some cases, there is a familial genetic link. Once this condition develops, it is crucial to seek proper treatment at the dermatology department of a regular hospital. Treatment can include medication combined with red and blue light therapy. After treatment, it is possible to completely cure the condition; however, acne tends to recur, so it is important to avoid spicy and irritating foods and to minimize staying up late to prevent relapse.