Causes Treatment Should You Squeeze Blackheads? Treatments to Avoid Prevention Blackheads, also called open comedones , are a type of acne. They are flat and—unlike pimples—are not swollen or painful. They usually appear on the face, especially the nose, and are often so small you can't see them. Blocked pores cause blackheads. Nose acne can be caused by either acne vulgaris or acne rosacea. A good skincare routine can be key to helping prevent both types. The exact cause depends on which type of acne is on the The more you mess with the pores on your nose, the more likely they are to dilate, accumulate even more oil, dead skin, and bacteria, and get inflamed. Treatment. FAQ. If you have a bump or pimple in or on your nose, you may find it irritating or painful. The most common causes of a bump in or on the nose are acne, bacterial, or fungal infection. A painful bump in the nose could also be caused by trauma from picking your nose or a nose piercing. It is likely that a pimple or acne could develop on the oiliest parts of your nose. If you have the following symptoms, you may have a pimple on your nose: small red spot; spot is slightly raised WP95u.