Using concealer on the lips generally tends to be very drying and setting it with powder is likely to cause your lip colour to apply unevenly. There are quite a few things you can do to tone down the natural colour of your lips and make lipstick look more intense.
Lip primer. Using a lip primer will prevent colour from feathering and fading and much like an eye primer will make colour appear more pigmented. I like Too Faced Lip Insurance
Lip liner. Using a lip liner that exactly matches your lipstick shade over your entire lips as a base will not only make your lipstick last longer, but will help the colour look much more pigmented. My all time favourite lip liners are Essence Lip Liners (which are also budget friendly)
High pigment lipsticks. Many lipsticks come in sheer, lightweight and moisturising formulas, if you have very pigmented lips these will be no good for you. Instead, opt for highly pigmented lipstick formulas, these don’t necessarily mean expensive products, just products packed full of intense colour. I love: Wet N Wild Mega Last Lipsticks, Rimmel Kate Moss Lasting Finish Lipsticks (the apocalips are great too, but are more of a gloss) MAC Lipsticks.
If worst comes to worst and that still doesn’t help you can try mixing a little creamy concealer in with a lip balm and applying it to your lips, but be careful as it can be drying and taste a lip gross.
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I hope I helped you and if you need anything else feel free to ask.
If any product you use irritates you discontinue use immediately.