Get him to a vet ASAP. When you call, explain the wound, don't just "my snake has a cut". Most (good) vets will at least work you in - even if it means sitting in the waiting room for a while.
Waiting a week potentially has already let infection set in. It might not be bad enough to form pus and smell bad, but that does not mean that it isn't brewing. Snakes are tough creatures by design, but if his skin splits so easily there may be a much bigger issue going on. While his immune system and "mother nature" may be enough to get the wound healed he will be much more susceptible to other illness while he is trying to heal.The clear fluid coming out is serum, just like in our own skin, and as that leaves his body, he dehydrates. Essentially a wound like that is acting like a wick for the moisture in his body and letting it evaporate.
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