What would cause a bumpy red rash on an trunk?

Several medical conditions and factors can cause a bumpy red rash on the trunk of your body. Here are some possible causes:

1. Heat Rash (Miliaria):

Heat rash is common during hot and humid weather. It occurs when sweat ducts get blocked, causing sweat to accumulate under the skin.

2. Hives (Urticaria):

Hives are itchy, red, and swollen welts that can appear on any part of the body, including the trunk. They can be caused by various factors such as allergies, certain foods, medications, and infections.

3. Eczema (Atopic Dermatitis):

Eczema is a dry, itchy, red, and inflamed skin condition. It can appear anywhere on the body, including the trunk.

4. Psoriasis:

Psoriasis is a chronic skin disease characterized by red, scaly patches of skin that can appear on any body area, including the trunk.

5. Drug Reactions:

Certain medications, such as antibiotics and painkillers, can cause allergic reactions, leading to a bumpy red rash on the trunk.

6. Fungal Infections (Ringworm, Tinea Corporis):

Fungal infections like ringworm can cause red, itchy, circular rashes on the trunk and other body areas.

7. Viral Infections:

Some viral infections, such as chickenpox, measles, and rubella, can cause red, bumpy rashes on the trunk and other parts of the body.

8. Insect Bites and Stings:

Insect bites and stings, such as from mosquitoes, fleas, and spiders, can cause itchy, red, and swollen bumps on the trunk.

9. Contact Dermatitis:

An allergic reaction to a substance that directly touches your skin, like latex, certain fabrics, or plants, can cause a red, bumpy rash on the trunk.

10. Scabies:

Scabies is a contagious skin condition caused by tiny mites that burrow under the skin, causing intense itching and a bumpy red rash.

If you develop a bumpy red rash on your trunk or other body areas and it persists or causes discomfort, it's essential to see a healthcare provider for proper diagnosis and treatment. Depending on the underlying cause, they may recommend medications, ointments, or lifestyle modifications to manage the condition effectively.