I have had several dozen terminal illnesses.

I survived every one.

It is possible in your language filipe, that "dermographism" means something else... like marks on the skin.

In English it means a specific disorder connected to allergy and hives.

If you stop making yourself so stressed out, you will heal faster, and feel better. If you cannot do that yourself, don't be afraid to seek professional help from a psychologist or whatever.

Everyone gets frightened at some time or other. But most people learn to deal with that, and move past it when they realize they are just making things worse. It is part of life and experience. That's all.

http://www.ncbi.nlm.nih.gov/pubmed/10723018

This is what dermographism looks like:
http://www.flickr.com/photos/excalip...phic-urticaria

Do this, with a pencil that is not sharp, write something on your forearm. If you have dermographism, it will look like this picture.
If not you will see nothing. And don't press hard and hurt yourself. Heavy pressure is not needed.
There are many other examples on Flickr of real dermographism.

You are fixated on this, in the face of evidence to the contrary.