That would depend on what striking the pressure points achieve mechanically.
If it's just "does [some %] extra damage", then it would be a passive.
However, if it's something like outright paralyzing, stunning or disabling someone, causing them to suffer diarrahea or vomit or go completely numb, then that would be considered an active skill.

Bascailly, any combat skill with a particular effect, or that has a notable impact on the target/area it is used on/in, is an active skill. All active skills cost MP.

For example, in the case of a pure fight.

Something likethis would all be considered 'active skills':

[i]Explosive Punch:[/i] Infuses your fist with fiery fury and, upon striking someone or something, unleashes a blast of explosive flames that both knocks the target back and deals physical and fire damage.

[i]Stunning Palm:[/i] You strike an enemy with a well-placed, high-precision palm-strike that makes them flinch and become momentarily defenselss for a short time. Doesn't do a lot of damage but leaves the opponent open for successive, undefended beatings.

[i]Sleeper Chop:[/i] With a carefully aimed chop, you strike a vital area of your enemy, causing them to collapse into a heap on the ground, fainted and useless. This skill only works against opponents' with exposed vitals though and is useless against heavily armored targets.

[i]Jewelbuster:[/i] An inelegant attack where you punt a male enemy's crotch. Despite the outrageously low and dirty feeling you're left with afterwards, none can deny the efficacy of this attack, as it leaves the target writhing and helpless on the ground. Only works against male humanoids with no, or very weak, lower-body armor.

I hope this helps. Otherwise, I'll try to explain it ... Better, I guess? xD