It could be a malevolent creature that lives in the shadows. This creature might feed on fear or negative energy. It latches onto a person, and as it draws out their energy, it leaves bruises on their body. These bruises are like a sign that the creature has marked them for further torment.
Maybe it's the work of a cursed object. A person could pick up an old amulet or something similar in an antique store. Once they have it, an evil force associated with the object starts to inflict bruises on them, slowly draining their life force as the bruises spread.
A bruises scary text story could be about a person who wakes up every day with mysterious bruises on their body. They don't remember how they got them. As the days pass, the bruises get more numerous and darker. One night, they feel a strange presence in their room and then see a shadowy figure hovering over them. They realize that this figure might be the cause of their bruises, but they're too terrified to move or call for help.
One thing that could cause a scary Facetime story is lighting. If the lighting on one end is really bad, it can create spooky shadows or make the person look really pale and ghost - like. Also, if there are bugs in the Facetime app itself. It might accidentally show parts of the background in a really strange way, like making it look like there's someone else in the room. Sometimes, our own overactive imaginations can also turn a normal Facetime call into a scary experience. For example, if we see a random object in the background that our mind interprets as something scary.
A young woman named Lily started getting bruises on her legs. She lived alone in an old apartment. One day, she found a hidden room in her apartment. Inside, there were pictures of people with bruises all over them. As she looked closer, she saw that the bruises seemed to form a pattern. That night, she woke up to a cold touch on her leg and more bruises appeared. She soon discovered that the apartment was built on an ancient burial ground and the spirits were marking her as their own.
There was a boy who played in an abandoned building. After one visit, he noticed bruises on his legs. He thought he had just bumped into something. But then new bruises kept appearing every day. He told his parents, but they didn't believe him. One day, while exploring the building again, he heard a faint cry. He followed the sound and found a locked room. The door suddenly opened, and a cold wind blew out. He felt something grabbing his arms and legs, and more bruises formed. He ran out as fast as he could, and never went back to that building again.
Another possibility is that it's a cursed object. For example, an old chest that has some dark magic in it. Every time the magic stirs, perhaps trying to break free, it causes the chest to thump thump against the floor or the wall where it's stored.
In a scary story, it could be caused by an evil spirit. The spirit might be trying to torment the person by making their feet burn, as a form of punishment or to keep them from escaping.
No, 'Bruises' is likely fictional. Many stories are created from the imagination of the author rather than being based on real events.
Ghosts can cause a scary aura. Their presence, often associated with cold spots, unexplained noises, and a feeling of being watched, creates a sense of dread. For example, in a haunted house story, the apparitions of the dead can make the whole place feel spooky.
Another reason might be related to his home situation. Although it's not as prominent in the fanfiction's context perhaps, in the original story, the Dursleys were not kind to Harry. If this aspect is incorporated into the fanfiction, it could be that he got the bruises from their mistreatment before coming to Hogwarts.
I don't really know what 'yarn bruises' means exactly. It could be something unique to a specific type of yarn - related activity. Maybe it's about the marks left on yarn when it's dyed in a certain way that gives the appearance of bruises.