Blackheads are a form of acne caused by clogged hair follicles in the skin. While they are not necessarily harmful, keeping them can lead to potential issues such as enlarged pores, skin inflammation, and an increased risk of developing more severe forms of acne. It is generally recommended to address blackheads through proper skincare routines, exfoliation, and possibly seeking advice from a dermatologist for targeted treatments or products.

For more information, you can refer to reputable sources such as:

1. American Academy of Dermatology – Acne Resource Center: [Acne Overview](https://www.aad.org/public/diseases/acne-and-rosacea/acne)
2. WebMD – Acne Guide: [Blackheads](https://www.webmd.com/skin-problems-and-treatments/acne/ss/slideshow-blackhead)
3. Healthline – Blackheads: [What Are They and How Can You Get Rid of Them](https://www.healthline.com/health/blackheads)
4. DermNet NZ – Acne and Acneiform Eruptions: [Blackheads](https://dermnetnz.org/topics/blackheads)

If you want similar questions answered on this website, check out related queries on skincare, acne treatment, or blackhead removal methods.