Well sometimes even a cold could be dangerous and you should see the doctor first.
But if you want to use magic, then use herbs (thyme, chamomile, calendula, elder lat.-sambukus, raspberry,), also helps lemon, ginger and garlic. Make hot teas and lay down in bed.
But do your work and research every herb before giving to your friend!
And using kitchen witchery - you also can enchant your teas or food for healing.
I would suggest transferring the sickness into an organic matter such as an apple or Orange. There are many ways to do this, is simplest being a mix of candle Magik and chanting.
Simply place the organic matter into blessed water, running water, or salted water to cleanse it. Then rub it over the area of symtoms in this case being the face, chanting: "sickness and illness, all things bad, I move you now into this object instead." Chant this until you feel it is done, then bury the organic matter so that when it dies and decomposes becoming one with earth the sickness wil die and be gone as well.
Cold is mostly a viral infection. There is the best by my opinion antiviral herbs. And vitamins, minerals.... Not any spell. :-)
Agastache_rugosa, Marigold flower, and similar.
If the illness is serious then please consult a doctor or any other health official first. I read down the posts and saw you wanted the spell for a friend who has a cold. Even so, they should go to the doctor. While they are doing so you may cast a spell in their honor so they can have a speedy recovery. A spell for a speedy recovery after they have went to the doctor would help.
The Common Cold (Coryza) cannot be "cured", because there are far too many different viral causes. The "symptoms" can be treated, the headaches, runny nose,etc. But the cold "cures" itself in three or four days. If a cold lasts longer than that, it is a "new" infection. A cold is a minor illness that our own immune system usually takes care of. However, it is always better to consult a professional doctor, as a cold can sometimes (rarely) turn to pneumonia; and that is really serious!
Lumpino, one can make things worse if you use the wrong herb. As for the cold, try honey and lemon in very warm water to relieve the symptoms. Also, breathing in steam from eucalyptus added to water will help. Anything to get it out of you. Your body is pretty much equipped to do this, but relief from symptoms is always a wecomed thing..
