Origin: Greek suffix -itis
Dermatitis has 2 different meanings across 1 category:
inflammation of the skin; skin becomes itchy and may develop blisters
"After spending too long in the sun, he developed a painful case of dermatitis on his arms that left him scratching at the new blisters."
Inflammation of the skin.
"After spending hours in the hot sun, his arms developed a painful rash that the doctor diagnosed as dermatitis caused by inflammation of the skin."