What are the reasons for a lump at the back of a child's head?

Patient's question:

The daughter of my sister recently suddenly noticed a hard lump about 4.5 cm in size at the back of her head. She usually didn't pay much attention, but she discovered it accidentally while giving her a bath. Currently, her child shows no discomfort, and the lump is painless. What could be the reason for this?
What kind of assistance is needed: What could be the cause of a hard lump at the back of a 2-year-old's head?

Doctor's answer:

The above conditions are commonly seen in manifestations caused by folliculitis, acne, or cysts, and secondarily in cases where subcutaneous skin breakdown may occur. These can generally be confirmed through a thorough examination. Currently, the possibility of folliculitis being the cause is considered higher.
The above suggestion is to take the baby to the hospital for examination. Once it is confirmed through examination that the symptoms are caused by folliculitis, it is recommended to pay attention to maintaining scalp hygiene and avoiding spicy and cold foods.

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