Limericks-1

These are my limericks I dunno whether they are technically correct, but I'm sure the comments I get will help me correct any mistakes. Cheers! Read on.

There was once a man from Burma,
He suffered from Leuco- Derma.
He darkened his patches,
And broke out in rashes;
He blames it on his karma.

There was once an old Sheikh from Muscat.
He kept all his money in a casket.
His apprentice knew,
With it he flew.
He didn't know the Sheikh had a musket.

There was once a girl called Shreya,
Who spent her days in prayer.
Along came Nitin,
And she was smitt'n.
Now she has no time for prayer.