See your doctor for scabies
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Actually that's not right. Scabies is caused by microscopic parasitic mites or bugs that burrow under the skin. This causes the skin to itch and get red rashes. It is a contagious disease and is spread through touch.
No mites grow or travel under the skin. The bumps on the arms can be due to scabies, allergy to food or allergic reactions of medicines. The scabies lay eggs and these eggs can not be seen by eyes. These eggs freely move on the skin causing irritations. I advise you to visit a dermatologist for proper diagnosis and treatment.