In the first kissing scene with Imhotep and his woman, an inoculation scar is clearly visible on Imhotep's left arm. Boy, the ancient Egyptians sure were advanced in medicine...
1) Mr Vosloo can't be blamed for having a scar like that, most people have them. 2) Most people wouldn't notice. 3) Perhaps Imoteph was meant to have been bitten by a savage mosquito.