dermatosis vs skin disease

dermatosis and skin disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
dermatosis	Yes	No	No	No
skin disease	Yes	No	No	No

As nouns, skin disease is a hypernym of dermatosis; that is, skin disease is a word with a broader meaning than dermatosis:

dermatosis: disorder involving lesions or eruptions of the skin (in which there is usually no inflammation)
skin disease: a disease affecting the skin

Other hypernyms of dermatosis include disease of the skin, skin disorder.

dermatosis (noun)	skin disease (noun)
disorder involving lesions or eruptions of the skin (in which there is usually no inflammation)	a disease affecting the skin