In even rarer cases, people with a penis who produce semen can be allergic to their own seminal fluid—a condition called post-orgasmic illness syndrome. Symptoms of this condition can happen within ...

Systemic mastocytosis is a rare health condition in which too many mast cells (a type of immune system cell) build up in the body, causing allergic reactions and other health issues.

These systemic reactions—as well as those linked to surgical tools and medications—are relatively common. Rashes are one type of these reactions that can develop after surgery for various reasons.

Typically, reactions to immunotherapy are local - redness, itching, and swelling of the injection site; however, systemic reactions can also occur - swelling of the throat, difficulty breathing, ...

To date, only three patients have been reported to develop systemic allergic reactions to PFO occluders without apparent rash but with positive patch-test results. [95–97] Each of these patients ...

In addition to worsening of skin lupus lesions, many patients also experience more generalized skin or systemic reactions to light that are not their typical skin lupus. According to the ACR, ...

Of the 769 visits for insect sting reactions, 120 were considered to meet the criteria for a systemic reaction to an insect sting. The insects involved included flying hymenoptera (bees ...