What Causes Pimple On Scalp. When the scalp reacts to an irritant or allergen such as a chemical it. What causes scalp acne.

Skin infections or those within the body due to bacteria viruses or fungi can cause a hard scalp bump. There are so many factors that can make you have these pimples on scalp causing headache. And that is the excessive appearance of either bacteria or fungus.
Hair care products that contain heavy ingredients like oils are a trigger for breakouts on your scalp.
And that is the excessive appearance of either bacteria or fungus. Hair care products that contain heavy ingredients like oils are a trigger for breakouts on your scalp. Avoiding a shave for 3-4 weeks is often helpful. The basic biological principal.