Need to ask whether this is mold?

It looks like mold to me. If you want to know for sure, spritz it with a 50% bleach and water solution and see if it goes away. If it's mold it'll vanish in about 10 minutes.

Okay I'll give it a go. Should I be concerned if this is poisoning me?

Mold is very common. The chances are good that it's just regular old every day annoying mold and nothing poisonous.

Okay well I cleaned it with a dettol anti bacterial spray and it looks mostly clean now. So I guess I'm good?

There are not guarantees in life, but the probabilities are with you now

Mold is a fungus, not bacteria - but I gather dettol still worked. Rosborne is right that diluted bleach is the ticket for mold. There are also spray products for mold in the U.S., but I've no idea about availability of them in Malaysia.

Yes, it is a type of mold.
Mold problems in your home or business can have serious effects on you, your employees and your loved ones. And it affect our body internally we couldn't understand it for many days.

If you find small mold presence in any surrounding area. Then use these tip to reduce their effects.
Prepare a solution of chlorine bleach & water :-
By taking one part bleach to 3 parts water – or get hold of a household detergent like Domestos bleach spray with bleach as an active ingredient.
Using a stiff-bristled brush, scrub the infected area. Rinse thoroughly and dry.

If mold presence are in bigger amount.
Then, I recommend you to hire any nearby mold removal specialist to solve such problems.