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My daughter had it a few years ago, we just gave calpol and nurofen for discomfort. Didn't put sudocrem, but she didn't have spots on her bottom - only hands and feet. And yes the spots were very itchy and turned into water blisters but I can't recall putting any cream on them.
It was painful to eat because of her ulcers, so we stopped for milkshakes and ice cream anytime she wanted them as she couldn't bear to eat normal food.
It's very contagious though so be really vigilant around other kids! My daughter got it from her cousin who got it from nursery. It normally affects small children up to about 5, I read that school age children have enough immunity to fight it off.
Hope she is on the mend soon.