Not cleaning your curtain
Letting your curtain get mildew and gross with a literally many black spots which might be mold spores is extremely unhygienic and will be happened as a fungal infestation. As among bathroom habits, these can form on your curtain if you allow it damp and scrunched abreast of one side.
What to do:
Always draw the curtain across and let it dry once you are done using the shower. Clean it out once during a while or once you notice it’s getting dirty. If it gets to dirty either bleach it or replace it.
