Sometimes they itch but not always. I thought it was heat rash so I treated it with monkey butt, hydrocortisone cream . It has not gone away and I have had it for over a week now.

I don't think crabs are red.

Until you cook them. (sorry I couldn't resist)

Or they get sunburned.

Seriously , they are not red.
And I understand you can pull them off
And put it on a piece of paper so
You can see it better,
They will move around.

If I had a rash in the pubic area for a week
I would go to the doctor.