How is there blood spot on glans surface to return a responsibility

Male glans surface has blood spots, in fact, mainly because of pigmentation caused. If the patient has a history of local application of drugs before, it will cause skin and mucosa to show lesions or pigmentation, the general patient has no obvious discomfort, will not cause pigmentation lesions progress. It is also possible that because the patient has undergone circumcision surgery before, during the operation, due to circumcision caused by vascular disconnection, will cause the loss of blood supply to the glans local mucosa, so there will be ischemic state, part of the mucosa will increase pigmentation, will not affect sexual function, just abnormal appearance.