Skincare products: good/bad ingredients?

[Guest guest]

I'm trying to figure out, by looking at labels, which ingredients

may be helpful and harmful in sunscreens and makeup. (I rarely

wear makeup, but now and then I need to.)

Every sunscreen irritates and stings, some worse than others.

I understand that dimethicone and cyclomethicone in

sunscreens are very helpful in preventing irritation. PABA and

alcohol are to be avoided. What other ingredients should be

avoided?

Thanks.