Forehead wrinkles are a common feature in men. They are caused by the tension and gravity on the skin above the forehead. These muscles attach the skin on top of your head to your skull, and as they get bigger over time, they pull on the skin on top of your head. These wrinkles can be hereditary or they can develop as a result of aging. If you notice any wrinkles round your forehead that don’t look normal (deep forehead wrinkles), you should see a doctor to investigate the cause.