Hi, I am looking for å SCARY, horror GHOST manga.
Preferably not much blood or gore and not to old.
Any suggestion?

Something like ghost hunt.
And no need to mention when they cry, another, ibitsu or doubt.

🙂 

Kinda hard to feel scared from still images on a page honestly. But if you're doing this for the holloween spirit, I think you may like this manhwa one-shot. Btw... read with headphones on. =P

http://comic.naver.com/webtoon/detail.nhn?titleId=350217&seq=31

If you don't mind anime, you could try Yami Shibai.

You're not making this easy but i something. I think what you are looking for is more psychological horror or suspense.

Hitsuji no Uta

Sarcasm just doesn't work over the internet.

That scared me 🤢 . I didn't even have headphones on, but if I did I would have probably screamed.
I'm not going to be able to go to sleep ... , but that's probably because I'm paranoid, and think I see things in my peripheral vision.

I would 2nd that oneshot.

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Goes from more scary to least scary, top to bottom. I put skyhigh as least because the ghosts are a lot more human, and its more of a mature look at human choices, regrets and the afterlife.

6000
Hoozuki island
Hiki
Forest of lore though that isn't completely ghosts...
Sugiru Juunana no Haru
Teizokurei Monophobia
Shinohara Chie Kessakushuu
Skyhigh

Mail is a fairly good horror/ghost story manga. Chapters are fairly standalone, with very loose connection (namely the main character).

Kurosagi Corpse Delivery Service Same guys as Mail. It actually takes place in the same universe, but there's close no crossover between the two.
Teizokurei Daydream has some nudity. It's purely incidental though, as the mc is a SM queen as her day job. Trust me, it makes sense.

Sarcasm just doesn't work over the internet.