Which of the following is an example of epidermal cysts?

Epidermal cysts are typically small, round lesions that occur when a hair follicle becomes clogged with keratin and other cellular debris. Milia are a perfect example of this type of cyst. They are small, white, keratin-filled cysts that often appear on the face, particularly around the eyes, and are common in newborns but can occur in individuals of all ages.

Milia form when the skin surface does not exfoliate properly, leading to a buildup of keratin under the skin. They are not inflamed or painful, which is characteristic of true cysts. Given this description, milia exemplify the nature and appearance of epidermal cysts effectively. While the other conditions mentioned (like rosacea, fungal infections, and acne vulgaris) involve different skin processes or infections, they do not represent the same cystic characteristics that are synonymous with epidermal cysts.