Pityriasis Rosea? Has Anyone Had a Child Who Got This?

I had this when I was a child. I was the only one in my family to get it and don't remember having any symptoms beyond the rash. I had a few scars that were only visible for the next couple of years, now they are completely gone!
Did you ask your doctor how your son could have gotten it? I don't even know what the cause is.

Yes, I had it when I was 19 (and in college). I am 32 now. For me it started as a larger scaly spot on my forearm and then spread to both arms and my back and a little on my stomach. It lasted 3-4 months. They were itchy and annoying. Luckily it was winter in the midwest when I got em and so I just wore long sleeves and it wasn't obvious to anyone. After a month into it, I went to the doctor who looked at it for one second and was told it was ringworm and that I should apply cream. The cream did nothing. So, I went and they said it is probably too hard for me to apply the cream and they gave me an oral medicine. That didn't work either. So I went back a third time (to a new doctor) who said it was obviously a really bad case of ringworm and it needed a stronger medicine. He had to check my lungs and liver function because the medicine was so potent. He also had to call my insurance company and get special clearance because the medicine was over $300 and necessary. Three hours after I left his office, I got a personal call from him. He said that something about my rash didn't seem right, and he researched further. He came to the conclusion it was pityriasis rosea. He said that it didn't have a known cause, wasn't contagious, and didn't need treatment. It would run its course and that would be that.
So, I paid A LOT of medical costs and ran around to see lots of doctors only to find out it was just a pain, not a problem.
To answer your questions-
The way it is contracted is unknown.
No one else got the rosea I had (I had a very close boyfriend at the time).
The symptoms for me were a large patch on my arm and smaller ones scattered around my arms back and torso. They were itchy, peeling, and generally disgusting to look at.
No scars or signs of rosea after it ran it's course, which for me was like 4 months.
I have NEVER known another person who had this. But, that is possible because people don't go around saying they have a rash and showing you!

I've had it, and it ain't fun or pretty. I was about 20, and then I had a bit of a relapse at about 28. They never could tell me how I got it, but I confirmed it with online pictures. I've never known anyone else with it. It can leave faint scars, but probably won't since your baby is so young. I just had to let it run its course, and I don't remember how long that was--sorry. To help with itching (crazy itching!), I let them give me a cortisone injection in my butt. The water pressure in the shower really irritated me, so I had to take baths, and I used Aveeno. Sorry I don't remember more.

I had it in middle school. I don't remember the symptoms and I don't notice any scars (I'm 32 now). My son had it when he was 3 (he's 4 now). His started with the dry round patch of skin on his chest, then he developed the rash on his trunk area. He didn't seem to really have any itchiness and I haven't noticed any scars, but I haven't paid attention or really looked for scars. His lasted 3-4wks in total I think. I just put lotion on him every night. He also has impetigo, but mildly it seems. He gets sores that open, but never really drain unless he rubs it enough to bleed. He only gets them on his face. Those do leave a scar because its hard to get him to stop rubbing the area. We use antibiotic ointment for that and bandaids as needed to keep him from rubbing it. And with the pityriasis rosea no one else got it when I had it or when my son had it. Not contagious, but apparently impetigo is although no one else here has gotten that either.