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Lower Arm

Hard, small bumps on the forearm are most commonly caused by skin conditions that form cysts, warts, or abscess. A hard, painful lump on the forearm can be caused by trauma from an injury, or even an insect bite. Other less common causes include fatty tissue growth that forms a hard lump under the skin of the forearm. Learn more below about other causes and treatment options.
Often a swollen forearm is caused by insect bite or contact to certain plants. Forearm swelling with pain may be the result of trauma from an injury. You may also notice redness, sensitivity to touch, and swelling of the hand.
Your left or right forearm pain can be caused by a fall, diabetes, certain infections and immune dysfunctions. Learn more about forearm pain causes & symptoms.
Experiencing pain in both forearms could implicate repetitive strain from overuse, or trauma from an injury. Compressed and damaged nerves, or a wrist sprain can cause aching and sore forearms. Read below for more information on causes and treatment options.