Mould spores are all around us. They become visible when they land on a surface and are left to grow and spread.
Mould will spread as long as there is moisture. If your home suffers with mould it is most likely to be caused by condensation.
You can get rid of mould by washing down the affected surfaces with a bleach solution. These are widely available in supermarkets and DIY stores. You can also buy special paints that are more resistant to mould.
The only permanent cure is to reduce the levels of condensation.
If you do not reduce the amount of moisture in your home it is likely that the mould will come back