is it bad to draw on yourself with pen?

Here is the composition of what is in a standard oil based ballpoint pen (this formula will vary between manufacturers)

if any of these seem toxic to you, then the short answer is yes (as they can and will dissolve into the skin)

But i can tell you right now, you will inhale more carcinogens in a day in New York, than a smiley face drawn on your arm

(EN) An oil-based ink composition for a ballpoint pen which comprises a colorant, a resin and a solvent selected from among an alcohol having a vapor pressure at 25°C of 0.001 mmHg or higher, a polyhydric alcohol and a glycol ether as a main solvent accounting for 50 % or more of the total solvent, and satisfies at least one of the following (a) to (C): (a) further comprises a neutralized product of a phosphate ester and polypropylene glycol; (b) further comprises a chemical substance represented by the following formula (1) or (2): (1) wherein R represents an alkyl group having 10 to 30 carbon atoms, or (2) wherein R represents an alkyl group having 10 to 30 carbon atoms; and (c) comprises, as the above main solvent accounting for 50 % or more of the total solvent, a solvent selected from among an alcohol having no aromatic ring in the molecular structure thereof, a polyhydric alcohol and a glycol ether, and further comprises a neutralized mixed product of a phosphate ester and an additional solvent selected from among an alcohol having an aromatic ring, a polyhydric alcohol and a glycol ether in an amount of 0.1 to 15 wt % relative to the total amount of the ink composition; and a ballpoint pen using the oil-based ink composition. The ink composition allows the suppression of the blur in the beginning of writing and can provide a feeling of writing excellent in softness and smoothness.

(JA) not available

well have you ever thought about it this way? lets say you draw a smiley face on your arm. you dont try to wash it off or anything...ink doesnt just evaporate into the air like water so where do you think it goes? it sinks into your skin... im sorry it its freaking you out but thats life. hope this answer really helped you :D

Yes....