"Allspice is on the Food and Drug Administration's list of herbs generally regarded as safe for external use, though its highly concentrated oil should never be swallowed. Ingesting as little as 1 teaspoon can cause nausea, vomiting and even convulsions." .... but if you have eczema or other inflammatory skin conditions, you're not supposed to use the oil on your skin.
Also, the active ingredient, eugenol, while an antioxidant in smaller doses, is actually becomes carcinogenic as you increase the dosage. The problem is, nobody knows where that threshold is, and apparently, it can differ significantly from person to person.
Through the (SCD) Specific Carbohydrate Diet, explained in this book, our son was able to get off medication and thrive. He healed himself and was able to go away to college. Last month he had a relapse, had surgery and by going back on the diet he was able to put himself in remission. The doctors are amazed with his latest tests and told him he did not need medication, but he must stick to the diet. I have bought over a dozen of these books and shared them with doctors, family members, and friends. I strongly recommend this book for any IBD/IBS issues.