Brown spots/ bumps (Sesame like) on S. Cylindrica
My Sansevieria Cylindrica has two or three tiny brown protruding spots which are sesame like on the middle or upper middle part of the leaves. Those spots seem do not enlarge or develop. They just look like sticking on the surface of the leaves. Otherwise are fine. Actually, the whole plant looks healthy. It also grows a few new buds. Would anyone here please tell me what are those brown spots? How should I deal with them?
Thanks a lot.