Extreme itchy rashes on my hands palms and between my thighs.

Hello guys,I stay with my sis and she has these extreme itchy rashes on her hands and between thighs for two weeks now,they are becoming worse(increasing)
they look like inflammation, she isn’t sexually active ,she has tested negative for HIV ,
I am afraid they might be infectious,
she went to the hospital, they told her to go to big hospitals to get some tests done,she is also complaining that her left side of abdomen hurts,
do any one of you have an idea of what are these rashes?
pictures are attached below ! I am afraid that they are infectious, I am thinking of finding another house, am I overreacting??? image