Folliculitis: This is an inflammation of the hair follicles, often caused by bacterial infection, which can lead to small boils or pimples. It's a common condition that can occur anywhere on the body where hair grows, including the head.

Acne: While more commonly associated with the face, acne can occur on other parts of the body, including the scalp, leading to small boils or pimples.
Furuncles (Boils): These are localized infections of the skin and subcutaneous tissue, typically centered around a hair follicle, and can appear as small boils.
Keratosis Pilaris: A condition characterized by small, rough, sandpapery bumps or patches on the skin, often on the arms, legs, buttocks, and cheeks, but can also appear on the scalp.

Meningitis or Brain Abscess: Although extremely rare and unlikely to present solely as small boils, any infection on the head should prompt consideration of more serious conditions, especially if accompanied by symptoms like fever, headache, or neurological deficits.
Cellulitis: A bacterial skin infection that can cause redness, swelling, and sometimes boils. It requires prompt treatment to prevent spread.

Demodex Folliculitis: Caused by the Demodex mite, which can lead to inflammation of the hair follicles, resulting in small boils or acne-like symptoms.
Sycosis Barbae: A type of deep folliculitis that occurs in the beard area but can also affect other parts of the head, leading to small, painful boils.
Eosinophilic Pustular Folliculitis: A rare skin condition characterized by recurring itchy, pus-filled bumps, often on the face, neck, and scalp.