disease of the skin

NOUN
19 LETTERS · STARTS WITH D

disease of the skin is a valid 19-letter word worth 27 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
D2I1S1E1A1S1E1O1F4T1H4E1S1K5I1N1
2 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 4 + 0 + 1 + 4 + 1 + 0 + 1 + 5 + 1 + 1 =27 PTS
DOUBLE WORD → 54TRIPLE WORD → 81
MEANING

What does disease of the skin mean?