Water allergy L29.8

The term "water allergy" is not common in medical terminology because it is pathophysiologically incorrect. Behind the term water allergy 2 clearly defined clinical pictures are hidden:

• Urticaria aquagene (aquagenic urticaria)
• Pruritus aquagener (aquagenic itching)

Urticaria aquagene: Aquagenic urticaria is a rare (about 100 cases have been documented so far, a significantly higher number can be assumed) subtype of physical urticaria, in which the appearance of pinhead-sized, reddened, follicular papules in the contact area after water contact is typical. It often occurs only after prolonged contact with water (within 2-30 minutes after contact).

Pruritus aquagener: The aquagenic pruritus (aquagenic itching) occurs as intensive, localized or generalized itching (sometimes burning, stinging or pain = aquadynia), which occurs immediately (about 1/3 of the patients) or after a latency period of 2-15 min. (about 2/3 of the patient) after contact with water, and subsides after about one hour. The aquagenic pruritus is considered by many to be a special form of aquagenic urticaria.