Ask a doctor on the topic of Allergology

Hives-like rash on the forearm.

May 30, 2015 | 30,00 EUR | answered by Dr. med. Ive Dr. Schaaf

For several weeks now, I have been experiencing a hives-like rash on my forearms (in small areas). It starts with a prickling sensation, then itching, and then raised mini welts that look like they have been stung by nettles. After about half an hour, it disappears and there is no trace of it. There are also days when nothing happens, but today for example, I had it in the evening on my forearms (12 small ones) and about 5 on my waist. Now everyone is scaring me that I might be allergic to food, etc. Since then, I have been eating allergen-free and especially low in histamine. What do you think it could be? I have lost 12kg by not eating, which is great, but not at this cost. My doctor said, based on the photo I showed him, that it was a contact allergy. I am completely lost and scared because I don't know if I can eat normally and if I will survive. I don't have headaches or stomach problems, and I don't have histamine intolerance like some people do. I just often have trouble breathing, but I have always had that. It's just worse at the moment. Lung diseases are common in our family, which may be important to mention. I also have a thyroid problem. I had severe hyperthyroidism, but now my values are normal, yet I still can't tolerate iodine. I get a feeling of pressure in my throat and become nervous. Therefore, I have to avoid it as much as possible. Could the rash be related to this? This uncertainty is driving me crazy. I have a photo of the rash, how can I send it to you? Thank you for your help. Kind regards.

Dr. med. Ive Dr. Schaaf

Good day,

It doesn't sound like a food allergy, as that would usually show up after consuming certain foods. Since the rash keeps appearing on your forearms, a contact allergy seems quite likely. It would be advisable to show your findings to a dermatologist, who is essentially the "rash specialist". In the meantime, I would recommend going back to eating normally.

Please make notes of when and how long the rash has been present, and any other symptoms you have noticed, in preparation for your appointment with the dermatologist. Also, make a note of which substances - including fabrics and detergents - your skin has come into contact with in the hours before.

The dermatologist will likely want to test which substances you are allergic to, and this list can help them identify the potential triggers.

If the rash is very bothersome or persists for a long time, you may consider getting an antihistamine from the pharmacy, such as Cetirizine or Fenistil.

Kind regards,

Dr. Schaaf