Can pimples occur due to excess masturbation in males ?

No : You would have pimples regardless.

No: This is just one more story that people who want to manipulate you tell you to frighten you. I'm sorry someone tried to deceive you. You're not entertaining yourself excessively if you're doing the other normal things guys do -- meeting folks, learning new things, enjoying activities with others. Your acne can be managed with your physician's help.