A hard lump on the back of the head of a 5-month-old baby is normal if it is physiological. But if it is a pathological cause is not normal phenomenon, such as cysts, folliculitis and so on.
1. Physiological reasons: after the birth of the baby, the immune function is relatively active compared to adults, sometimes there will be some lymphatic tissue behind the pillow or the back of the head, this lymphatic tissue can be active, there is usually no pressure, redness, usually belong to the normal phenomenon, generally do not need to be treated.
2. Pathologic causes:
(1) Sebaceous cysts: they are mostly formed when the ducts of sebaceous glands are blocked and the contents of the glands keep increasing. It will appear as a round swelling on the skin, which is usually close to the normal skin color, and may also be light blue in color.
(2) folliculitis: may be the baby sleep more sweat, baby skin is more delicate, produce discomfort often friction. Easily lead to bacteria, fungi and other pathogens caused by follicle infection, often manifested as red papules.
If the back of the baby’s head there is a hard lump, press the baby is more repulsive, or fluctuating feeling, it is recommended to consult a doctor in a timely manner, follow the medical advice for further examination, with the help of the doctor to clarify the cause, and targeted treatment or treatment.