Hi @lisabeans - I'm not familiar with Lichenoid Keratosis but did find some information doing a few searches.

PubMed - Benign lichenoid keratosis: a clinical and pathologic reappraisal of 1040 cases.
-- https://www.ncbi.nlm.nih.gov/pubmed/16148406

DermNet NZ - Lichenoid keratosis
-- https://www.dermnetnz.org/topics/lichenoid-keratosis/

You can also find a lot of information using Google Scholar (https://scholar.google.com/)

John