These small Dark brown bumps on your face are called DPN ( Dermatosis Papulosa Nigra).
DPN is mainly hereditary and can increase in number and size with age , sunlight exposure,hormonal changes,etc.
Next Steps
The best way to treat DPN is removal with RF machine. Removal procedure is very simple and painless and Leaves No scar.
Health Tips
Also for prevention you need to apply Sunscreen ( as per your skin type ) regularly.