Snape's greasy hair

[Deb]

No: HPFGUIDX 74307

Snape has greasy hair, and so did the man in the creepy store in
Knockturn Ally.  And when Snape took memories out of his head, there
were cobweb-like strands coming out, too.  This did not happen when
Dumbledore put his memories into the Pensive.

Maybe there is a meaning to the greasy hair, other than just neglect.
 Rowling has not mentioned anything about him that suggests he is
neglectful about his appearance in any other way, that I can think of.

I can't imagine what it could be, though. If it had to do with the
Dark side, then Lucius would have greasy hair, too.  Ideas?

Deb S, aka readzalot, Canada