On my Ruellia Petunia underside leaves are these brown elevated round spots about a half size of a thumb tack and on the stems of my plants are these white elevated round spots just a little bigger than the brown and when plucket off and turned over displayes a flatten 4 quarten redish color thing that seeps red substance (can it be blood) when stabbed. The brown spots cannot be plucket off they just smear and leave a brown mark on leaf.