There are many reasons for bumps on the head, depending on the shape and size of the bumps, whether they are soft or hard, to further confirm the diagnosis of what kind of bumps they are. There are several clinical causes for bumps on the head: 1. Acne: Acne is a skin disease caused by unbalanced oil secretion, mental stress, improper diet, genetics, etc. It often appears on the face, scalp and other parts of the body. 2. Bruised bumps caused by trauma: Patients need to be asked if they have a history of collision or trauma, and can apply herbs that activate blood stasis to relieve symptoms. 3, Folliculitis: inflammatory bumps formed due to local abnormal oil secretion, resulting in hair follicle blockage. 4. Neurofibroma: or other systemic tumors may also appear in the head.