How to simulate the model of a human skin in HFSS or MWS CST?

Hello, has some books, papers or information how I can model/simulate the human skin in an electromagnetic simulation program like HFSS or MWS CST?

hello is there anybody to help . skin is dispersive and i don know how to define it in cst

Which frequency band are you interested in? Most of the studies were lead for mobile phones purposes and will be around 950 MHz up to 2.45 GHz.
At the beginning of my career I designed antennas for a large mobile phone manufacturer and did SAR measurements, but I don't now if I can retrieve the interesting documents for your purpose.
Here a few documents as a starting point (quick googled):
Microstrip antennas for direct human skin placement for biomedical applications
Safety assessment of breast cancer detection via ultrawide-band microwave radar operating in pulsed-radiation mode
Specific absorption rate (SAR) distribution in the human head at gsm frequencies