Rosacea most commonly affects patients aged 30 to 50 with fair complexions, most notably those of Irish and Northern European descent, but it affects and is probably under-recognized in darker-skinned patients. The age of onset helps distinguish rosacea from acne. Rosacea is often passed on in families, with women being afflicted more often than their male counterparts. The sun may also heat the skin and cause it to blush. None of them has been definitely confirmed, other than the contributing factors of sunlight and heat.
As mentioned above, acne can appear at any age, even to babies and senior people. Some people may have the notion that acne is caused by poor hygiene but this doesn't seem to be the case.
The principal causes of the over-activity of the skin glands are hormonal changes. Teenagers and pregnant women can experience higher levels of hormones called androgens which in turn stimulate the skin glands into greater activity.
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