Feeling sensation of water drops on skin

[Raunak08]

I often feel the experience of sensation of cold drop of water on skin. Firstly I used to think it is Dysesthesia or Paresthesia or any neurological problem I even thought it to vitamin B12 deficiency and took medicines but it didn't worked. But one day when I was reading a book in a completely dry room then suddenly I felt sensation of cold water drop on my hand and my eyes were telling there is nothing but I touch there with fingers and I could feel my fingers getting wet. I could feel some liquid there but it is higly volatile in nature and if I didn't touch there immediately i didn't used to feel wet.
Then I thought it is something my own skin is producing so whenever I used to get those wet sensations I immediately used to touch their and could feel some liquid and my fingers getting wet.   So,in my case it is something that is produced by my skin which is yet to be discovered by doctors that what causes the those experience other than any neurological problem.
Please help me what is that I am really exhausted.