Blisters My daughter has skin blisters that resemble hives. They are all over her arms and face and on her legs. They appear to get worse if she is exposed to the sun. She was tested for porphyria and the results were negative. Porphyria cutanea tarda is a disorder caused by a deficiency in enzymes that make heme.
Heme is a chemical that carries oxygen and makes blood red.
The main symptom of this disorder is blisters on sun-exposed areas. To make a diagnosis, the doctor tests the blood, urine and stool. Skin blisters and rashes in children can be caused by a variety of problems, especially infections. Take your daughter to a dermatologist for additional evaluation. Check the calendar.