I have combination skin with breakouts mainly on my forehead and chin. I've been using an Eucerin niacinamide cream for three months but I'm not seeing much improvement. Should I switch to a salicylic acid serum or can I use them together?
Trying salicylic acid might make sense since niacinamide hasn't worked for you, but be careful: if you use them together you risk irritating your combination skin, especially on areas that are already sensitive. Better to introduce salicylic acid gradually, maybe two or three times a week at first, and then only add niacinamide alongside it if your skin tolerates it well. Another thing a lot of people don't think about: salicylic acid works better if you also use a decent moisturizer afterward, otherwise it can dry out your normal/oily areas too much and make the irritation worse.
If you don't see results after three months, niacinamide alone probably isn't enough and it's worth trying salicylic acid, which is a more aggressive chemical exfoliant for comedones. You can use them together, but start with salicylic acid every other day (maybe two or three times a week) so you don't irritate your skin too much, and see if you really need both after a while. Your forehead and chin are somewhat different zones - if your acne is superficial and full of comedones salicylic acid should help, but if it's deeper the problem might be something else.
Don't jump straight into a strong salicylic acid serum if you've never used it before: the risk of irritating combination skin is real, especially since you're already using niacinamide. What almost nobody mentions is that you should test salicylic acid in a gentler formulation first (like a toner or cleanser with low concentration), maybe 2-3 times a week initially, so you can see how your skin reacts without burning everything off. If it goes well after a couple weeks, then you can eventually consider the more concentrated serum. As for using them together, theoretically you can but honestly it doesn't make much sense at the start: it's better to see first if salicylic acid alone makes a difference, without overloading on active ingredients.
Don't ditch the niacinamide right away just because three months wasn't enough time. Sometimes your skin needs longer to adjust and show real changes, especially if you have combination skin that reacts differently in different zones. But I get the frustration, so yeah, it makes sense to introduce salicylic acid - the thing is how to do it without causing damage.
What the others told you about combining them is true but incomplete: you can use them together, but not at the same time and not every day. Salicylic acid (2% is a reasonable dose to start with) you'd use maybe two or three times a week, preferably in the evening, and the morning after you could apply niacinamide which actually helps calm irritation. Or use them on different days if you're still in the testing phase. The important thing is to start slowly with salicylic acid - lots of people use it too often at first and end up with red, irritated skin, which ironically makes acne worse.
One question: when you use niacinamide, are you applying it to clean, dry skin? And do you use a moisturizer after? Because if your skin is dehydrated, even the right treatments struggle to work properly. With combination skin, the trick is keeping the T-zone hydrated without making it greasy.
before you jump to a new active ingredient, ask yourself: are you using niacinamide at the right concentration and, most importantly, are you applying it to clean, dry skin? because a lot of times results don't come through because of that, not because the product doesn't work. that said, if after three months really nothing has changed, you could add (not replace) a toner or a light spray with salicylic acid to use only on your forehead and chin every other day, so you see how your skin reacts without risking irritating it right away - what percentage of salicylic acid are you considering?
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