The word dermatoses is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (39 words)
dearest, demasts, demates, demotes, deserts, dessert, emoters, maestro, masters, meteors, radomes, readmes, reasted, redates, remated, remates, remotes, reseats, restems, reteams, roasted, roseate, seamers, seamost, seaters, sedater, sedates, smarted, smeared, stardom, steamed, steamer, stereos, stormed, streams, stroams, tasered, teasers, tressed