Two trees always grow together here in the jungles of Mexico. Chechen and Chaca. One is toxic and the other is healing. Yesterday, I got the sap of the chechen (also known as black poisonwood) on my hand and within a few minutes I was extremely uncomfortable. My skin was red and burning and itching and swelling very quickly. The sap of the chechen tree is extremely toxic and, if left untreated, can cause first and second degree burns, blisters, and a nasty rash that itches so