Ok, this is gonna be real quick. I still hear clients saying "it's in my makeup" when asked if they wear sunscreen daily so I'll say this once more for those in the back.
SPF in your makeup is great. It's an extra bonus layer of protection, and I'm all for it.
But it's not enough.
Why? The amount you apply. No one is wearing 2 finger-lengths or about a teaspoon of foundation on their face, and most certainly not all over their neck and ears as well. (That would be...gross.)
Find a sunscreen you love, and wear it every day. The options are endless these days, there is something for everyone. I'm always here if you need help finding the right formula for your skin.