Remedies for allergic dermatitis in which allergic reactions of the type IV participate, containing as the active ingredient diethyl L-lysylcromoglycate represented by formula (I) or its nontoxic salt. These remedies are efficacious in treating allergic dermatitis typified by contact dermatitis in which allergic reactions of the type IV participate mainly and atopic dermatitis in which allergic reactions of the types I and IV participate.
