Factors that can cause an acne flare include:
- Changing hormone levels in adolescent girls and adult women 2 to 7 days before their menstrual period starts
- Oil from skin products (moisturizers or cosmetics) or grease encountered in the work environment (for example, a kitchen with fry vats)
- Pressure from sports helmets or equipment, backpacks, tight collars, or tight sports uniforms
- Environmental irritants, such as pollution and high humidity
- Squeezing or picking at blemishes
- Hard scrubbing of the skin
- Stress.
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