Which of the following skin conditions involves inflammation caused by blocked follicles?

Acne vulgaris is characterized by the inflammation of the skin, primarily resulting from the blockage of hair follicles by excess sebum and dead skin cells. This blockage can lead to the formation of comedones (blackheads and whiteheads), papules, pustules, and sometimes cysts. The inflammation associated with acne vulgaris is largely due to the proliferation of bacteria, particularly Propionibacterium acnes, within these blocked follicles.

This condition reflects the body's response to the clogging of these follicles and the subsequent bacterial activity, making it a classic example of follicular inflammation. Other skin conditions, such as contact dermatitis, eczema, and rosacea, may involve inflammation, but they do not specifically involve blocked follicles as a defining factor. Also, the underlying causes and presenting symptoms differ significantly for those conditions compared to acne vulgaris, reinforcing why acne is uniquely linked to the blockage of hair follicles.