For some time now I notice some unexplained razor Sharp marks on my body. I don't keep nails hence the possibility of it being me subconsciously scratching my self is zero, especially on places the hands can't naturally reach without great effort. I also notice it happens frequently whenI am lodged in a hotel. Can anyone tell me what could be the cause?

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How clean is the hotel because these marks can be cause by even you scratching your back while sleeping, .wall gecko can cause it as well expect you are so sure the hotel environment is very clean then check the hotel water might be your reason of scratching your body while you are sleeping