My friend is undetectable hiv+ and he ejaculated on my hand. i noticed then a nail cuticle gave me a brief sting like lemon on a wound. am i in risk?

Likely no large : risk but I would recommend testing just to be sure

Very, very unlikely: This is not of concern. Significant risk exposure from following: . device contaminated with blood, exposure from needle in deep vein, deep puncture wound. Break in skin or mucous membrane and copious fluid or blood exposure. I would not be concerned with your exposure.