well, obsessions, actually. Like my obsession with good grammar. Did you note that in this post’s title I used plural (Dos) and not possessive (Do’s) form?
infectious disease causing eruptions of rose-colored papulae, early 14c., plural of Middle Englishmasel"little spot," which is perhaps from Middle Dutchmasel"blemish" (in plural "measles") or Middle Low Germanmasele, both from Proto-Germanic*mas-"spot, blemish" (source also of Old High Germ...