You have to look at the cost to benefit ratio here. Is there any reason you cant wait a few days? Stitches penetrate the full thickness of the skin and provide a route for infection to enter your body. The stitches themselves when wet will actually conduct water, along with other foreign matter, down their length and under your skin. There are adhesives, such as Dermabond, that can be used in place of stitches to hold opposing tissue surfaces together in some cases. In a pinch they can be applied over stitches for a waterproof or airtight seal. There are also waterproof dressings that can be used. Opsite or Tegaderm is a clear membrane that can be applied over a wound. Their adherence is greatly increased if the skin is prepped with tincture of benzoin. Both the dressing and Dermabond can be combined for increased water resistance. Prophylactic broad spectrum antibiotic use could add further protection in a high risk environment. Drysuits create internal conditions perfect for bacterial growth and should not be seen as a barrier to infection. There are waterproof rubber socks a limb can be vacuum packed in for diving with a cast or dressing such as the Xerosock but this is of no use to you. However in your case the scalp is not conducive to any of these products. Any medical professional is going to tell you to wait even if it is very minor. The scalps rich blood supply makes it very resistant to infection but if an infection does occur there are a number of very sensitive structures close by that it could easily spread to. You could be blinded, cosmetically injured or even die. If there is some reason you cant wait then the extra expense and risk may be justifiable to you. Every case is different and you need to discuss your case with your doctor. If he/she says no but you are going to do it anyway then let your MD or DO know your intentions. While they may not support your decision they can still provide you with tools to aid you on your quest.
:doctor: