I have 3 small bumps/lumps on my penis head.I have seen a doctor about it and he gave me Daktacort cream to put on but it doesn't seem to work.The bumps/lumps are very flat.During sex it turns red.What can it be?

The doctor should have diagnosed it for you. It could be a number of things, including an STD. Don't have unprotected sex with anyone until you know what it is. Go see another doctor.