You cannot permanently shrink pore size
Use a daily broad-spectrum SPF 30 or higher
Cleanse gently twice daily
Use a leave-on salicylic acid product
Use a retinoid at night
Use niacinamide regularly
Keep skin moisturized with non-comedogenic products
Avoid heavy, pore-clogging products
Exfoliate chemically, not aggressively
Consider professional treatments such as laser, microneedling, or chemical peels
See a dermatologist for persistent enlarged pores