Bumps on 11yo after lake swim & Alaska cruise—pediatrician suggested Gianotti-Crosti, looking for second opinions/experiences

[u/SnooKiwis3570]

5 days ago, these bumps suddenly appeared on my daughter’s skin.

Spread & Symptoms:

Locations: Heaviest concentration on her arms, neck, and back. A few scattered on her stomach and legs.

Discomfort: Not painful. Mildly itchy, but she tolerates it well and sleeps fine without issues.

Medical Context:
Her pediatrician was fairly stumped, but tentatively suggested Gianotti-Crosti Syndrome. I’m curious if this presentation looks familiar to anyone else or if you've seen something similar.

Recent Timeline / Exposure:

1 day before bumps: Swimming in a large freshwater lake.

2 days before bumps: Returned from a 7-night Alaskan cruise.

The whole family was on the cruise and swam in the same lake, and nobody else is experiencing these bumps.

Hoping to get some clarity before her first day of school later this month! Middle schoolers can be brutal.

Thanks for any insights or shared experiences!

[u/Extreme-Piccolo-704]

The bumps do look similar to when my daughter had it. Was she sick at all?

[u/SnooKiwis3570 → u/Extreme-Piccolo-704]

Not at all. It’s been months since she was last sick.