Weird diaper rash?

Lauren

My one year old has had a diaper rash for a few days and we’ve been loading up with cream/frequent diaper changes. Last night I noticed a red line on his groin and thought it was from his diaper. I’ve been making sure that the diaper is not laying in this spot but it’s getting darker. He also has a spot and small line on the other side. Not really sure what it could be from.