International Board of Certified Lactation Consultant (IBCLC) Practice Exam

Milia is characterized by tiny white papules caused by what?

1. Viral infection

2. Blocked hair follicles

3. Overproduction of sweat

4. Excessive sun exposure

The correct answer is: Blocked hair follicles

Milia are indeed characterized by tiny white papules that are commonly caused by blocked hair follicles. This condition occurs when keratin, a protein found in skin cells, becomes trapped beneath the surface of the skin, leading to the formation of these small, white bumps. Milia can often develop in various areas of the face and are especially common in newborns, though they can appear at any age. This clarification helps highlight the distinct nature of milia compared to other skin conditions. For example, viral infections typically present with symptoms such as redness, swelling, or the presence of vesicles or pustules, which are not characteristics of milia. Similarly, overproduction of sweat can lead to conditions like miliaria or heat rash, which also differ in appearance and mechanism from milia. Lastly, excessive sun exposure may cause skin changes such as sunburn or pigmentation alterations, but it is not associated with the formation of these small, keratin-filled cysts. Thus, understanding the origin of milia as a result of blocked hair follicles is essential for correctly identifying and differentiating this skin condition from others.