Pass this one up.
I loved the original ColorStay concealer and I had high hopes that this product would be similar. Well, no such luck. I smears around rather than drying to that opague, impermeable finish the original had. It's too sheer to give any real coverage, and disappears in a flash.
Good colors, though. One has to be polite.
That's the only redeeming quality this product has!
It might work for you if you don't have a lot to conceal, but you still have better options. I have no idea what the term "blemish" means. Probably a teeny amount of salicylic acid is in there, but there are skin care products for that. I don't need it in my makeup.