My husband has small white like bumps on his penis that have white seeds in it. What is that and how do you get them?

It's best that he be seen by a doctor to rule out any STDs. It could be a blocked gland or something more serious; but a doctor will need to examine him.

He should be prepared to tell the dr:

How long it's been like this
How often it appears
If it's painful
Is this the only one or are there other bumps

I wwould have to say that your husband needs to go to the doctor and get a check up to rule out any serious or possible STDS.