Skin contact with allergens or irritants can lead to itchy, raised bumps. Common triggers include detergents, metals, or plants like poison ivy. Boils are painful, red bumps caused by bacterial ...

Scalp folliculitis may appear as small, red bumps along the hairline or on ... Papules are small raised bumps on the skin that are less than a centimeter in diameter. They can look like a pimple.