Thank you for writing.
This (or any) kind of psoriasis can run in families so may be hereditary - but it is not contagious.
Inverse psoriasis appears as reddened, inflamed areas in skin folds such as behind the knee, under the breast, and around the genitals. This form of psoriasis is worsened by friction, sweat and obesity, and lacks the scales that are present in other forms of psoriasis. Treatment may include topical steroids, anti-yeast or fungus medications.
Please talk to your doctor about what may work for you.