Typically, the blistering and itching starts between 3 and 13 days after the  para-phenylenediamine black hair dye "Black Henna" is applied.  The blistering is precisely in the area of the original design.  Sometime there will be full body sloughing off of skin, blistering, itching.  Infections can enter the raw blistering area and cause further problems and scarring.  These pictures show typical progession of itching, blistering, open sores, scabbing and weals. 

Be patient, there are many pictures here to load. 

This first series shows the day by day progression of blistering, itching, and wheals. 

These dolphins also show the progression of blistering and weals. 

Blisters rising in the area where PPD "Black Henna" was applied, leaving large open wounds. 

Itchy blisters often get infected and scab over, making scarring more likely. 

Intensely itchy weals follow the initial blistering phase. 

The weals last for months before subsiding to a red scar.

The scars last a long time.

Some people have a full body reaction which may include sloughing off of skin, blistering,  and loss of body hair. 

None of these people would have suffered if the artists had used traditional natural henna.