What are the red ichy lumps under your skin on your arms..?

Red itchy lumps under the skin on your arms could be caused by several conditions, such as allergic reactions, insect bites, hives, or eczema. These lumps often result from inflammation or irritation and may be accompanied by redness and swelling. If the symptoms persist or worsen, it's important to consult a healthcare professional for an accurate diagnosis and appropriate treatment.