i HAVE A SON, WHO IS GROWN, HE HAS ALLERGIES. EVERY SINCE HE WAS A BABY, HE HAS RASHES ON BACK OF NECK, ARM CRESS, AND BACK OF LEG JOINT AREA, ALSO. IT NEVER WENT AWAY, AND HE KNOWS SOME OF HIS TRIGGERS FOR ALLERGIC REACTIONS. BUT he WAS NEVER TESTED FOR ALLERGIES. Now he has an area stretching the length of his back left leg. But it looks different, and he stated it itches, and he scratches it a lot. I advised him to see a doctor, but so far he has not. It worries me a lot, because as far as I know he has never had a skin reaction from his allergies,on this large an area of his body. It is sores with a dark area underneath, and it has obviously spread. He is in the sun a lot, and I was kinda worried. What else should I be looking for??? I am so nervous about this condition, and what it could be.