Small red bumps

Small distinct red bumps on the skin are most commonly caused by a heat rash. Heat rash or prickly heat is caused by the blockage of the pores that lead to the sweat glands. It is most common in very young children but can occur at any age, particularly in hot and humid weather. An infant does not sweat. The sweat is held within the skin and forms little red bumps or occasionally small blisters.