I am working on a project which requires me to detect the moisture levels of a person's skin. Would I be able to use the Arduino soil moisture sensor or any other sensor for this?
The real problem here relates to what sort of electrodes you are going to use.
As best I know, Arduino does not make a soil moisture sensor, so you are presumably referring to some or other module advertised as being "suitable to use with" an Arduino (or a Raspberry Pi, PIC, etc.).
So perhaps you cite - Web link - which so-called "soil moisture sensor" you have in mind, and we can discuss it.
Basically, all of these except the capacitive variety, have major problems with their electrode material which is also a concern with skin electrodes, depending on for how long you expect to use them or how repeatedly. 
Do you have a digital multimeter?
Yes, I do.
Hi,
Monitoring moisture for how long at a time?
Or at intervals.
Commercial skin moisture meters are for instant readings and not long contact periods.
Tom.... 
Then put the meter on a megohm resistance range and start playing. It will give you a clear idea of what you're facing.
Quite informative:
Design of a Handheld Skin Moisture Measuring Device for Application towards Eczema (mcmaster.ca)
Especially the parts about, Bioimpedance Analysis Method and the Capacitance Method.
The note about:" A device using the capacitance method is quite difficult to find. There
are very few companies that produce the device for public consumption", is interesting and helps with a direction to take.
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