What causes scabs from bumps on the head?

Generally, scabs and bumps on the scalp may be caused by excessive sebum secretion, scalp friction or irritation, folliculitis, seborrheic dermatitis, or scalp eczema. If discomfort occurs, it is recommended to seek timely medical evaluation and treatment at a reputable hospital. Specific causes are analyzed as follows:

1. Excessive Sebum Secretion

Increased sebum production during puberty or due to hormonal changes can clog hair follicles, leading to bumps that may break open and form scabs when scratched. Use oil-controlling shampoo, wash hair 2–3 times per week, maintain a light diet, reduce intake of high-fat and high-sugar foods, and avoid staying up late.

2. Scalp Friction or Irritation

Wearing tight hats or hairstyles such as tight ponytails for prolonged periods can cause scalp friction and localized inflammation, resulting in bumps and scabbing. Switch to loose, breathable hats, avoid tightly pulled hairstyles like high ponytails, gently massage the scalp when washing hair, and avoid scratching with fingernails.

3. Folliculitis

Bacterial infection of hair follicles leads to inflammatory red bumps, which may develop pus and form scabs after rupture. Topical treatments such as mupirocin ointment, fusidic acid cream, or oral cefuroxime axetil tablets may be used under medical guidance. Keep the scalp clean and avoid squeezing the bumps.

4. Seborrheic Dermatitis

Abnormal sebum secretion combined with Malassezia fungal infection causes pale red patches on the scalp covered with greasy scales, accompanied by itching. Treatments include ketoconazole shampoo, selenium sulfide shampoo, or vitamin B6 supplements, as directed by a physician. Avoid frequent hair perming or dyeing.

5. Scalp Eczema

Allergies or environmental irritants trigger scalp inflammation, causing clusters of small bumps, oozing fluid, and yellow scabs, along with significant itching. Medications such as desonide cream, loratadine tablets, or cetirizine hydrochloride drops may be used under medical supervision. Avoid allergens such as pollen and dust mites.

In daily life, choose mild hair care products; maintain regular sleep patterns and avoid mental stress; eat a balanced diet rich in vitamins; refrain from frequently scratching the scalp; minimize external irritants; and promote overall scalp health.