I have two groups of patients (A and B) with a congenital malformation which might present itself in 3 forms (a or b or c). Sample sizes are small as you can see, so I think the best test to check whether there's a statistically significant difference between the 3 forms in the 2 groups is a Fisher's exact test in a following 3x2 contingency table:
group A: 2 a, 12 b, 1 c group B: 5 a, 3 b, 1 c
My question is: how should I interpret the p value? I don't understand what is that referred to. Having the p value, how can I say that one of the three forms is statistically significantly more represented than the others (if true)?