General advice, not a diagnosis of mould or a treatment for symptoms. Don't mix chemicals. Symptoms that last or get worse need a doctor; the damp source needs a professional.
Mould on a wall is usually a sign of damp, and painting over it fixes nothing. Photograph the spot and let a painter or plasterer find where the water comes from. If a cough or breathlessness lingers, see a doctor.
At home, without taking risks
Photograph the mould and note any leak, condensation, water coming in from outside or damp rising in the wall. If you clean the mark but leave the water source, it will come back.
With a painter, plasterer or the right maâlem (master tradesman)
Damp can come from condensation, a leak, outside water or the building itself. Have the source found first: paint over mould looks fine for a while, then it returns.
With photos and dates
Keep photos and dates, and tell the landlord or whoever is responsible in writing. Who pays for the repair depends on the lease and the city, so check your contract.
At the doctor's if symptoms last
Damp and mould can affect your airways, eyes and skin, more so for people with an existing illness or a weak immune system. A cough, wheeze or shortness of breath that won't go away needs a doctor's advice.
Where to start
Pick a painter, plasterer or the right tradesman for the source, and see a doctor if symptoms last. Don't mix cleaning products or spread the mould around the house.
Each professional decides what is right for you after seeing you.
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Winter arrives, a dark patch shows up in the corner of the living room, or the bedroom starts to smell damp. Most of the time the water comes from one of these:
Then ask: what do you think is causing it? What does the job include? What will you do if the damp comes back?
If the paint is bubbling or flaking, see Paint peeling or bubbling: why?.
No. While the damp source is still there, the mould comes back. Find the cause and fix it with a professional.
A painter or plasterer, or another tradesman depending on the cause: a leak, condensation or a problem with the building.
If a cough, wheeze or breathlessness doesn't go away. If it looks serious, go straight to the emergency department.
Procedures change. If something here is out of date, tell us and we will check it again.