Clean make up brushes go hand in hand with clean, blemish-free skin, but it's all too easy to prioritise the 'important' things instead.
Keeping the tools you use on your face sanitary is a beauty essential, but to forego a weekly wash and use your make-up tools on a daily basis is what we all do - it's also the recipe for a make up bag full of invisible nasties.
A dirty blusher can mean you're sweeping tiny particles of bacteria onto your face, never mind those cheek bones you're keen to highlight. It won't hurt, but keeping on top of your facial brushes will mean the only thing on your face is the dusting of bronzer, or blusher, and not a potential infection.
An unwashed eyebrow brush can be deadly. Eye shadow brushes, just like eyebrow brushes need to be washed and replcaed on a regular basis, at least every three months because of how close they are to your precious peepers. If you've ever woken up with gunky eyes, or a sudden case of conjunctivitis (like myself a few weeks ago), then it's probably because you've borrowed a friends mascara, or other eye brush. Or, like me, used your own (unwashed) set of eye brushes, that clearly need a good rinse.
Foundation brushes. The fibres of foundation brushes are susceptible to bacteria and other bits lying around in your make up bag because the brush tips are soft and pliable (for smooth application). If you use a liquid foundation it's likely you use a smooth brush that is similar to a small, fine paint brush, or a foundation brush that 'picks' up the liquid easily. It's the qualities of such brushes that make them a breeding ground for bacteria.
To clean those brushes I recommend using an organic shampoo - you only need a little bit, but try not to use a non-organic shampoo because sulphates, perfumes, and harsh chemicals will irritate your skin.
With all this in mind you might want to give those brushes a wash. Like now.