Luckily I've never suffered from any major skin problems like acne but no one has flawless skin I still do have trouble spots (eg. black heads on my nose, dark circles) but I have learned to address those issues there is no cure but there is a routine to get rid of/minimize them.
My tips would be:
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Drink water, it really is the fuel your skin needs! the more the better. Also if you feel like your face is swollen (eg, swollen eyes) in the morning it's because your dehydrated - so drink water before you sleep to treat that problem.
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Moisturise morning + night (or once a day if you have oily skin), again, it's a must if you want fresh and glowing skin all the time.
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Have an effective day + night skin routine, everyone's skin is different so different products will work on different people, a good skin routine should have: cleanser > exfoliator > toner > moisturiser.
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For dark under eye circles (which is a very common problem) the best you can do is sleep well for at least 7 hours and have an effective eye cream used day and night!
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For blackheads, some people use those strips or just exfoliate but I like to use the black extractor tool to get rid of every single blackhead, it really works. I only have to do it once a week.
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Have a facial weekly, no need to waste money on spa facials, instead do it yourself at home. There are plenty of products sold that high end spas use like masks, blackhead extractor tools, facial steamers...etc. Read online/watch videos of how professionals do it to gain skill. It depends on what your problems are so develop a good facial routine for yourself and stick to it every week.
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Whatever you put in your body it'll show on the outside - So smoking will not do wonders for your skin, it'll cause more problems and increase early wrinkles. Make sure you are on a healthy diet. Get enough of each food group and exercise well!
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Mental health is very important as well, if you're stressed, depressed, etc it'll effect you physically and can take a toll on your skin (stress is the biggest cause for skin problems like acne) so be sure you to be aware of any mental problems that can be taken care of professionally if it is very serious.
That's all I have! Stay positive and I'm sure it'll show on the outside