Yes, you are correct. This is a fungus which has contaminated your nebuliser. In most cases it will not be dangerous. It is best to throw away all the contaminated plastic tubing including the container where you put the medicines and also the face mask. Get a completely new set to replace all of these contaminated parts. You do not need to take your son to be seen by a doctor but you must not nebulise him again using any contaminated parts with the nebuliser.
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