answer 1
This is one of those rarities in beauty products, it really does what it says! I purchased it to cover dark circles, but now have tossed out my concealer as I use the stick for any 'special' areas. As for wrinkles, well, short of cosmetic procedures, if you have deep wrinkles, nothing covers. However, small lines, and light crows feet, this may help.
For assistance with wrinkles, try a primer with silicone such as the tinted primer from Smashbox.
answer 2
under eye concealer uneven skin areas like side of nostrils blemish cover