What's the difference between metaplasia and dysplasia?

Benign vs precancer. Metaplasia (on the cervix) is simply cell changes that are not typical for that area. It is not considered dangerous or pre-malignant so nothing is usually done. Dysplasia, on the other hand, is a pre-cancerous change. Dysplasia can be mild or severe and usually requires surveillance or treatment. I hope that helps.