Are itchy bumps linked to prurigo nodularis or a food allergy?

Question

Hello doctor,

Could this be prurigo nodularis or some strange allergy? These insanely itchy, hard bumps started after a bad stomach virus last year, and now they are all over my arms, legs, and back. I scratch until they bleed, especially at night. I have tried steroid creams, antihistamines, and even nerve pain meds. But nothing helps!

My allergist mentioned something about mast cells and histamine. What does that mean in simple terms? Could this be linked to my IBS? I have noticed certain foods make the itching worse. Is there any kind of allergy testing that might actually help? Please help.

Thank you in advance.

Answer 1

Hi,

Welcome to icliniq.com.

I read your query and can understand your concern.

Prurigo nodularis (PN) is a chronic inflammatory skin condition marked by intensely itchy, raised nodules. These usually appear symmetrically on the arms, legs, upper back, and abdomen. The itch can be so severe that it affects sleep and emotional well-being.

Histamine is a chemical released by the immune system that helps transmit signals between cells. It plays a key role in allergic reactions, which occur when the body overreacts to normally harmless substances. Mast cells release histamine as part of the body’s defense mechanism, but when they react to non-threatening particles, they can trigger allergy-like symptoms.

To help manage PN, it is recommended to avoid inflammation-triggering foods, including:

Fried and processed foods.
Red meat.
Sugary items and refined carbohydrates.
Dairy products.
Spicy foods.

These may worsen itching or inflammation in some individuals.

Allergy testing can help identify triggers:

RAST (radioallergosorbent test): A blood test that checks for specific IgE (immunoglobulin E) antibodies.
Skin prick test: A small amount of allergen is introduced to the skin via a tiny prick to observe any allergic reaction.

I hope this helps.

Kindly revert so I can assist you further.

Thank you.