If the color of the glans is uneven, it is recommended to go to the hospital for a relevant examination to clarify the cause. There are several possibilities: 1. If there is red and white or local swelling, it is considered that there may be an infection. It is advisable to examine the relevant secretions or perform a bacterial smear to rule out infection, which can be accompanied by local swelling, increased secretions, erosion or pain. 2. If the glans surface is covered with a lot of white secretions, a fungal infection is considered to exist. If the glans is unevenly colored, often accompanied by local itching or local erythema, a fungal smear test is needed to confirm the diagnosis of fungal infection. 3, if the local color is blue or purple, it may be due to prolonged erection and local venous stasis, often in the erect state is more obvious, no special treatment is needed. 4, if there is local ischemia If there is a local ischemia, such as circumcision or circumcision, there may be a local blackish color caused by ischemia. It is necessary to lift the foreskin inlay, or wait for the restoration of blood flow reconstruction after surgery, the local blackening of the glans can be improved.