Bumps on the scalp can be caused by other skin disorders such as folliculitis, scalp acne, or dandruff. They could also show up due to an allergic reaction to a product or skincare routine.

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“Increased sweat can dry out the scalp and when mixed with oil can feel heavy and clogged,” Tompkins says. “In some cases, allergic reactions to products and product build up are the culprit.