Hello and welcome,
Rembrandt peroxide mouthwash contains hydrogen peroxide
,which can release peroxide radicals when comes in contact with the mucosa or lips.
This resulted in scabs which is non-scrapable.
Please discontinue the use of peroxide mouthrinses since your mucosa is allergic to this content.
Rinse mouth frequently using warm saline or betadine
Apply mucopain gel on the affected area.
Rinse mouth after every meals.
Please do not scrape the area using fingers.
Avoid intake of hot/spicy foods.
Hope this helps.