The spelling of the word "subpapular" can be explained using IPA phonetic transcription as sʌbpæpjʊlər. The first syllable is pronounced with a short "u" sound and the "b" and "p" are pronounced consecutively. The second syllable has a long "a" sound followed by a "p" and a "j" sound. The final syllable is pronounced with a long "u" sound, followed by an "l" and an "ə" sound. "Subpapular" is an adjective that refers to something located beneath the shoulder blade.
Noting an eruption of few and scattered papules, or one in which the lesions are very slightly elevated, being scarcely more than macules.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.