The body presents an incredible dichotomy to the knowledgeable observer.
On the one hand is quite resilient. It can heal wounds, replace billions of lost cells, actively fight off and create cures for diseases, and can adapt to a wide range of environments.
On the other hand, the body can be quite fragile. A thin set of electrical connections are all that allow the body to function as a whole, a number of natural toxins can easily overcome the bodies defenses, and the immune system developed to protect the body can even start attacking itself under a selection of circumstances.
The answer to your problem is to either see a therapist or start wearing concealing clothing such as "turtle-neck" sweaters.