Hello, Please evaluate your cosmetic and dental products used. Are there any recent changes that may be responsible for an allergic type reaction? Dietary changes also may be considered. Preservatives in many products are responsible for tissue reactions. You already have a known to have eczema and may be prone to autoimmune type reactions. It would be easy for you to eliminate a suspected product and see your reaction. The antihistamine Benadryl may offer some relief. You may need a prescription steroid lotion such as Betamethasone Dipropional to assist healing. See your doctor if the condition persists or worsens. A possibility is a reaction to your own salvia. This can occur with strep throat or oral yeast infection. Viruses are known to shed in bodily fluids. Have you had any recent illness? Thank you for your inquiry. I hope you feel better soon.