This video would have to be indeed called itch a sketch. A 27-year-old woman from Surrey, United Kingdom, has an amazing ability to do something. What it this amazing ability you ask? She is able to literally write on her own skin with a pen that doesn’t need ink. What? Is this for real? The answer is yes. 27-year-old Louis Sarabetty can write on her own skin without any ink. She only has to use the pressure of a pen to make it happen. In the opening of this truly amazing and odd science video, she is shown writing her own name, with just the pressure of a pen on her bare arm. It is wondrous to see her name appear out of nowhere on the exposed arm. This is truly weird science to the max indeedy.
Is Louise somehow allergic to the pen? How is it that she is able to write on her own arm this way? How can Louis use her arm just like a note pad? The answer is a condition that is called dermotographia. Dermotographia is a condition that is known as skin writing. When a person has this condition. They do have very sensitive skin. It is skin condition that reacts very quickly to pressure. It is quite a very complicated chemical process taking place, when this does take place, on Louise’s skin or anyone with this skin condition. The receptors on the mast cells of skin are releasing histamines into the bloodstream. This is something that one would normally associate with an allergic reaction of some sort. You can get swelling and redness of skin in connection with hay fever or allergies to dust or pollen. Therefore, the same process does happen with dermotographia, and it is the releasing of the histamine that is causing capillaries to become leaky so to speak. This amazing thing that Louise can do is simply a reaction of the immune system response. This immune system response is what is causing this leakiness, puffiness, and swelling that is occurring as she writes her name with just the tip of the pen on her arm. It is truly weird science and outrageous personified here.