I guess it wasn't the merps after all. I started to get the same reaction, but it went away. I guess it was just brought on by eating the mango, which activated the allergy again, but since it wasn't the sap itself it didn't turn into a full blown case of nastiness. But does that mean I can never eat mango ever again!?
I'm massively allergic to mangoes... I found out after buying mango shampoo and having a massive rash all the way from my head to my feet, I feel your pain!!! T_T
P.S I knew a fish named Herpes c: