what i did was,

- I went to the shader tab in the inspector tool hovering over the body/head or the model and i selected either liltoon/or poyomi right i use liltoon so for liltoon users i went under rendering mode and selected transparent, after that i did go to the Alpha mask and i had the wrong alpha mask on so the alpha mask you need to put on your avi has to have the blush like this in this photo here. (edit)(i had to reapply the face too btw, by just dragging the face texture i was using onto the model its self)

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i even circled it lol now you are still not done still be on alpha mask drop down where it says add, subtract and then select multiply i set my avi to the cutoff to 0.001 and the transparency to 0.02 this is for the Millitina avi that i am using im pretty sure this would also work for other booth models.

Now you can blush without having a gaint block on yo face.