There are multiple causes.
In the case of middle-aged and young people, clogged pores appearing around the nose may be due to high androgen levels in the body and sebaceous gland secretion, which is a physiological seborrhea.
If it appears during menstruation or puberty, it may be due to endocrine disorder during that period, which stimulates the sebaceous glands to secrete too much oil and block the pores.
If you have long term nervousness, excessive fatigue, lack of sleep, or like to eat greasy food, sweets and dairy products, it may also aggravate the endocrine disorder, causing excessive sebum secretion and blocking pores.