My husband after acceptance of a bath on all body has a red eruption + the storage...

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My husband after acceptance of a bath on all body has a red eruption + an itch. Approximately in minutes 40 all passes or takes place. Similar signs appear and at change of temperature (has entered into a warm premise or room from street and t. The item) WHAT IS IT CAN be? And HOW IT TO TREAT?
Yours faithfully,

[Smirnov K.V.]

Most likely it is a question of a urticaria, but on 100 % I am not assured or confident.

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Prompt, and how it to treat?