Red bumps on the top of the head of three-month-old babies may be caused by eczema, prickly heat, folliculitis and other diseases, and should be taken according to the cause of the appropriate treatment measures. 1. Eczema: infant eczema may be related to genetic, environmental and other factors, resulting in three-month-old baby red bumps on the top of the head, can be treated with topical glucocorticosteroid medication such as Dinaid cream. 2. prickly heat: the indoor temperature is too high, or give the baby cover too thick, wear too much, poor sweating may cause prickly heat on the top of the head, resulting in three months baby red bumps on the top of the head. You can use topical glycerin lotion and other drugs to treat it. 3. folliculitis: three months baby scalp hair follicles secondary bacterial infection caused by folliculitis, can also lead to red bumps on top of the head, you can use povidone-iodine wipe disinfection, apply mupirocin ointment and other antibiotic drugs. Three months baby head red bumps, need to take the child to the hospital pediatric examination, clear cause, all drugs need to be used under the guidance of a professional doctor.