The information provided here is not a replacement for a doctor. You shouldn't use it for the purpose of self-diagnosing or self-medicating but rather so you can have a more informed discussion with a professional TCM practitioner.
In Chinese Medicine dermatitis can be treated by one herbs that we have on record. Here is the list below.
Unprepared Rehmannia might help with dermatitis
Why might Unprepared Rehmannia (Di Huang) help with dermatitis?
Because it is a herb specifically indicated to treat dermatitis as can be seen on Unprepared Rehmannia's page.
Unprepared Rehmannia is a Cold herb that tastes Sweet. It targets the Heart, the Kidney and the Liver.
Its main actions are: Expels Heat by Cooling Blood. Tonifies Yin by promoting Fluid production. Soothes the Heart by calming Blazing Fire. Cools and nourishes.
Other symptoms often associated with dermatitis
Generalized body pain Irritability Severe fever and chills without sweating Feeling of heaviness Superficial edema in the extremities Alternating fever and chills Absence of sweating Palpitations Nosebleed Fever