Question 25

Comedones are formed when sebum hardens.

Comedones, commonly known as blackheads or whiteheads, are formed when sebum hardens. Sebum is an oily substance produced by sebaceous glands in the skin, and when it accumulates and solidifies in hair follicles, it leads to the development of comedones.

A) sebum

This option is correct because sebum is the primary substance responsible for the formation of comedones. When excess sebum is produced and trapped in hair follicles, it can harden and create blockages, resulting in the characteristic appearance of blackheads or whiteheads.

B) saliva

Saliva is not involved in the formation of comedones. It is a digestive fluid produced in the mouth that aids in the breakdown of food and does not play any role in skin-related issues like comedones.

C) perspiration

Perspiration, or sweat, is primarily composed of water and electrolytes and does not contribute to the formation of comedones. While sweating can affect skin health, it does not lead to the hardening of substances in hair follicles.

D) plasma

Plasma refers to the liquid component of blood and is not related to the formation of comedones. Comedones are specifically linked to the hardening of sebum, not any components of blood or plasma.

Conclusion

The formation of comedones is definitively linked to the hardening of sebum, making option A the correct answer. All other options are unrelated to the process of comedone formation, as they pertain to different bodily functions or substances that do not contribute to this skin condition.