Red bumps on the glans may be caused by glansitis, pearly papules, glans eczema and other factors. 1. glansitis: glansitis is mainly caused by bacterial or fungal infection, related to trauma, personal hygiene, autoimmune and other factors, will produce local inflammatory stimulation, resulting in erythema, blisters, vesicles and other symptoms at the glans. 2. Pearly papules: small red bumps on the glans may be pearly papules, at first the patient may not have obvious symptoms, with the development of the disease, may appear in the coronal groove and its surrounding red, white or yellow papules, pearly. 3. glans eczema: red vesicles and small pimples appear on the epidermis of the glans, mainly due to the symptoms triggered by the change of skin cluster-like blisters. It is recommended that patients with red bumps on the glans should seek timely medical attention and treatment under the guidance of a doctor. In addition, daily attention should be paid to hygiene to reduce bacterial growth.