Active sebum secretion
Physiologically, our sebaceous glands produce sebum to protect the skin and hair, but the aforementioned factors can increase sebum production, thereby clogging the pores.
Hyperkeratosis
In addition, thickening of the stratum corneum also contributes to clogged pores. For example, excessive sun exposure causes increased keratinisation processes (meaning that the stratum corneum grows faster), as a result of which the pores become blocked and can no longer release sebum, forming a sebaceous plug.
Active sebaceous gland activity
Increased sebum production, as well as thickening of the stratum corneum, can lead to the growth of pathogenic microflora, mainly propionibacteria, which causes inflammation.