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An open pore clogged with oil, which has turned dark when exposed to the air.

Self-care options include acne products available without a prescription. These help dry excess oil and promote peeling. A gentle cleanser and oil-free moisturizer also may help.

Seek emergency help if:

• A skin care product causes faintness, difficulty breathing, tightness of the throat, or swelling of the eyes, face, lips, or tongue.

See a healthcare professional if:

• Self-care steps don't clear up blackheads.