The investigative will apply the dexamethasone oral rinse 0.5 mg/5ml treatment. The oral rinse is considered a topical rinse because it is confined to the oral cavity (topical) and not swallowed. Subjects will be reminded by the study team via a phone call a few days before their visit that they must not drink water or eat at least 60 min before their visit. Once we get to the stage of the rinse, we will first their oral cavity with gauze. Then, we will instruct the subject to Rinse their mouth with 0.5mg/5ml dexamethasone for 2 min, then spit into a provided plastic cup the oral rinse. This will then be discarded down the drain.

The first control group will apply the dexamethasone oral rinse 0.5 mg/5ml treatment. The oral rinse is considered a topical rinse because it is confined to the oral cavity (topical) and not swallowed. Subjects will be reminded by the study team via a phone call a few days before their visit that they must not drink water or eat at least 60 min before their visit. Once we get to the stage of the rinse, we will first their oral cavity with gauze. Then, we will instruct the subject to Rinse their mouth with 0.5mg/5ml dexamethasone for 5 min, then spit into a provided plastic cup the oral rinse. This will then be discarded down the drain.

The second control group will apply the dexamethasone oral rinse 0.5 mg/5ml treatment. The oral rinse is considered a topical rinse because it is confined to the oral cavity (topical) and not swallowed. Subjects will be reminded by the study team via a phone call a few days before their visit that they must not drink water or eat at least 60 min before their visit. Once we get to the stage of the rinse, we will first their oral cavity with gauze. Then, we will instruct the subject to Rinse their mouth with 0.5mg/5ml dexamethasone for 2 min, then spit into a provided plastic cup the oral rinse. This will then be discarded down the drain.

The study drug is FDA approved (NDC- 0054-3177) and will be used as it would be used in a standard of care setting. The rinse will be administered on the same therapeutic dose to OLP/OLR (0.5 mg/5ml of dexamethasone oral rinse once (rinse for 2 minutes or 5 minutes), then spit the excess into a cup.

The oral rinse dexamethasone 0.5 mg/5ml will be used only on the subjects who participated in the study.

To investigate the amount (level detected in blood), through blood draw, of how much dexamethasone oral rinse is absorbed in the blood stream over two hours.

A clinical oral examination will be conducted for the REU scoring system this will determine what severity category they are in (what their REU score is out of 30 with 30 being most severe and 0 being mild lichen planus). The oral cavity will be examined based on REU scoring system to determine the subject belong to mild , moderate or severe group.

If there is systemic absorption, does it differ based on length of time of rinsing? This is for those in the control group who will be rinsing for either 2 minutes or 5 minutes. The evaluation is if there is varying amounts of the rinse detected in the blood after the various blood draws.