I don't remember if this movie was based on horror or not, more voodoo.. It's from the 80's and I remember seeing it on HBO back in 1987-88

A scene I remember:

A woman looking in the mirror at her face.. It shows these big blisters on her face and then they start to move, and all of a sudden they break open with bugs coming out of them, she screams... And that's all I remember

Any clues, I would appreciate them... Thanks..

Adam