Evaluate RLS-1496 Topical Cream for Actinic Keratosis

This clinical trial will assess the safety and tolerability of topical application of RLS-1496 cream to lesions and adjacent skin on the left forearm of adults with actinic keratoses (AK) on the arms. The right forearm will remain untreated as a control. The therapeutic objective of topical treatment with RLS-1496 cream is to clear or decrease the number of AK in the treated area, per lesion counts performed by the Investigator. The main questions it aims to answer are: * Is it safe to apply topical RLS-1496 cream to treat AK once daily for 28 days? * Does topical RLS-1496 lower the number of AKs or eliminate AKs in a treated area when applied once daily for 28 days? Researchers will compare results on the left (treated with RLS-1496) and right (no treatment) forearm. Participants will apply RLS-1496 to an identified area on the left forearm once each day for 28 days and have intermittent clinic visits to examine the arms and have the AK lesions counted until 28 days after the last application of RLS-1496. Participants will also have small skin biopsies on the arms.