"Old hooker (sick)" joke

A really horny man walks into a whorehouse, but only has ten dollars. He walks up to the manager and says "What can I get for ten bucks?"

The manager replies, "The only thing we got at that price is some old bag who's been in the business for 50 years."

The man tells the manager that it will have to do and he is instructed to go into one of the bedrooms. After about five minutes the old lady appears and the guy starts screwin' her.

"Damn! he says you are really dry."

"Hold on," she says and she walks into the bathroom. The old lady comes back out of the bathroom and they start up again.

The guy goes "This is way better, what did you do?"

The old lady replies, "I scratched my scabs."