Rete ridge flattening 2016-11-01T10:52:20Z Flattened rete ridges Flattened rete pegs Rete pegs (or ridges) are the epithelial extensions that project into the underlying connective tissue in both skin and mucous membranes. Rete ridge flattening refers to the loss of these projections so that the skin epithelium acquires a relatively flat appearance. Abnormal rete ridge morphology