Round clusters and little blisters on the penis are probably symptoms of a herpes genitalia-like disease caused by a virus. This disease also leads to the appearance of new blisters, even after treatment. The grade of blood glucose that equates to 124 is a tad beyond normal, suggesting diabetes can be the case. Despite the absence of symptoms, visit your dermatologist to check and take care of it. Otherwise, unbearable pain or visual damage may become a result at a later stage.