During my last two florida visits, I experienced a hive like rash on my arms and partially on my neck. The sunscreen was 50 spf containing zinc oxide, octinoxate, octisalate. I had to use a derm ointment topically and take an antihistimine to relieve symp

Photoallergic. Paradoxically, some ingredients in sunscreen other than titanium or zinc can cause an allergic reaction after interacting with sunlight. You may need to find an alternative with different ingredients. Another possibility is that you are taking a drug which make you sensitized to the sun and thus hives only at exposed areas.