That is very unusual. If you mean the plumb-bob ( diamond above the head ) it means that the Sim is in a bad mood ( hungry, low social, low bladder, bad hygiene, ect. )
I hope this helped, and if it's your actual SIM that's glowing red, I have no idea what might be wrong ( except if you changed the skin colour to RED )
You have your sim befriend the wolf pack leader (the wolf with glowing eyes), and then get it to bite your sim.
From what I know, glowing charcoal appears red due to the heat of the fire.
Its right above the hotel with the light beams glowing out of it.
It is glowing red hot because of the friction created between the space shuttle and the surrounding air.
its just a glowing red light to make it look nice
glowing red
That red filter means that Sim is very angry with your Sim and may even get into a physical fight and/or try to bully your Sim! Did you cheat on that Sim with another Sim by flirting, kissing, or woohooing? That is most likely what caused it if it happened suddenly! Or maybe that Sim was in love with the Sim that your Sim married and is angry with you for taking his or her love muffin. If it gradually appeared there, then your Sim was picking on and bullying that Sim until he or she got angry with your Sim.
you have to have an enchanter put an enchant on it and it depends on the enchant, in this case ill use bersirking and the wep turns glowing red
Oxygen will rekindle or relight a glowing splint.
Look at which of your motives are down and try to improve them.
either the sun or the moon
alright, the first thing your sim needs to do is find a wolf. if you add some trees to your lot then there is a greater chance a wolf will come. you will know you've found a wolf when a large black dog has bright glowing yellow eyes in the night time. the next thing your sim needs to do is become good friends with the wolf, it will then bite your sim and then every night your sim will become a werewolf.