Use the singular. A native speaker would not refer to the head as a spot. Perhaps an area.
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zazzex By the way, what does "most contact" means ?
most wide contact?
most often contact? It can mean both. "Most" is a quantifier, so we're using contact here as an uncountable.
But in a practical sense, the most contact is often the result of multiple contacts, which is a countable usage.
We often use "contact" to descri
zazzexThis absolutely makes zero sense.
" the spot my hat has most contacts with is the head"