transdermal patch vs skin patch

transdermal patch and skin patch both are nouns.

Word	Noun	Adjective	Verb	Adverb
transdermal patch	Yes	No	No	No
skin patch	Yes	No	No	No

As nouns, transdermal patch and skin patch are synonyms defined as:

transdermal patch and skin patch: a medicated adhesive pad placed on the skin for absorption of a time released dose of medication into the bloodstream

transdermal patch (noun)	skin patch (noun)
a medicated adhesive pad placed on the skin for absorption of a time released dose of medication into the bloodstream	a medicated adhesive pad placed on the skin for absorption of a time released dose of medication into the bloodstream