Hi Tinker, you can try with calendula - I use this one:
Hyland's, Calendula Off. 1x, Homeopathic Ointment, 1 oz (30 g) - iHerb.com
It can be hard to find out what causes a rash. I used to have a rash since childhood, and 7 years ago it disappeared. Few years later, it returned. So I did some brainstorming, trying to think of what I did differently - did I eat or drink something different? could it be hormonal? (I was pregnant or just had my first baby when the rash disappeared), could it be weather change? ... this way, I found out that I had a shortage on D3 vits, the vitamin we get from the sun. So in the months with less sunshine, I take D3 vit supplements. I don't get this rash any more.
Try to think of something that is different, something that could cause the rash, it could be something simple as cheese or peanuts.
I also suggest that you take a good multivitamin, extra C vitamin, and fish oil capsules (omega 3) (I get mine all from iHerb.com, the brand Now Foods), and if you don't get out in the sun much, also D3 Vits (minimum 1,000 IU).
If the rash is very severe, you may want to consult a (christian) orthomolecular consultant. They often know more about rashes than dr's do
Hope you find answers, if you have questions, please let me know, feel free to cc mail me.