Is grover disease contagious by contact or saliva or sexual contact? don't know about the disease

Grover's : Grover's disease (transient acantholytic dermatosis) is a condition that appears suddenly as itchy red spots on the trunk, most often in older men. Once confirmed (by biopsy) most cases of grover's disease last six to twelve months (which is why it was originally called "transient"). Unfortunately it may last much longer. The cause of grover's is unknown. Sometimes it seems to start up or worsen after exposure to extremes of temperature; other times it appears for no known reason. Therefore..It is not known whether saliva or sexual contact spreads the disease.