I was broke and trying to use a razor that i had been using for about 6 weeks, well it might have been a scapel as i took a strip of skin about 2" of my scalp. I did't think it would ever stop bleeding, so for about 4 weeks after not only did i have to wear a baseball cap when i went out but every time i shaved, i had to shave round the scab that had appeared! Hope my advice helps.
Jim