Your 14mths son is most probably suffering from some viral rash
.And at present you also seem to be developing a similar rash then most probably it looks like a chickenpox
rash though there is associated fever
in this kind of rash .Hand foot mouth disease leads to a lot of ulcers in the mouth so watch out for those in your kid.
I would suggest that you both need to be examined by a doctor for diagnosis of the condition .For the rash you could apply calamine
lotion .if it turns out to be the viral rash then these would subside in 10-15 days.