Yes, I will get burns on my hands sometimes if the garlic I am handling is very "hot", as in spicy. There is a type of chinese garlic we get that will do this. Try putting the garlic in oil instead. Also, if used in the vagina (as in placing a whole clove inside), you must be very careful not to "nick" the clove as it can cause burns. Some folks even need to wrap the clove in gauze.
I wouldn't feel stupid, how would you know otherwise? The only reasons I know this is because I have been burned, also (actually not just my hands, but the skin on the corner of my eye where I rubbed w/garlic still on my hands, duh...) and once when I saw a patient who wasn't careful about not nicking the garlic suppository she used (my mil/midwife told her that it was very important, but she didn't think it would matter... ) Yeah, I guess I would wait to use the calendula until the wound is semi-dry, I would really need to see it to give you advice. But calendula is wonderful for healing and once the bacteria are treated, use it to keep the skin in that are soft and supple and to avoid scarring. Comfrey is great, too, excellent for wounds, a very nice sitz bath herb, also.