Can Touch Range Spells/Effects Function Through Armor?


I am planning on playing a Grung PC for an upcoming homebrew campaign. The Poisonous Skin feature in Grung racial traits state:

Any creature that grapples you or otherwise comes into direct contact with your skin must succeed on a DC 12 Constitution saving throw or become poisoned for 1 minute. (One Grung Above p.4)

Now, this would be a problem if I wanted to support my party. (ie. Touch range spells) Would coming "into direct contact with your skin" mean skin on skin contact, or would the poison affect still work on skin and armor contact? Furthermore, is this the same deal with touch range spells? I guess I’m trying to find out: Can I, as a Grung, cast a touch range spell, like Cure Wounds, and bypass the poison effects by specifying that I touch the target’s armor? I’m not worried about enemies, because they are enemies, but more for my fellow party member’s sake.