Genital blistering may be caused by overstimulation, glansitis, genital herpes and other factors. 1. excessive stimulation: for example, excessive masturbation, causing excessive stimulation to the genital area, which will cause localized tension blisters, accompanied by tingling, redness and other symptoms. 2. glansitis: poor hygiene of the lower body may induce glansitis, the glans area for a long time by inflammatory substances stimulation, it will make the genital blisters, accompanied by itching, tingling, redness and other symptoms, and even ulcerated erosion. 3. Genital herpes: a sexually transmitted disease, when there is unclean sex, herpes simplex virus infection can be present in the genitals, which can lead to localized blistering of the genitals, accompanied by symptoms such as tingling, itching, and is highly contagious. If you have blisters on your genitals and are experiencing significant discomfort, it is recommended that you seek medical attention.