If I had this condition, here are a few things that I would do:
1. PABA and Magnesium have been used successfully to clear up this condition so I would be sure to get plenty of these from food and maybe even make a poultice of these foods to apply to the affected areas. I would also be sure to get plenty of essential fatty acids, silica, folate, and vitamins E, C, B, and A which are very important for healthy skin. Here are some significant sources of these nutrients: