I have brown lesions on my penis shaft and i'm noticing they're spreading. they don't hurt or itch. they have been there for almost 2 years. worry?

Probably warts: Some warts do disppear on their own, but unfortunately genital warts often don't. Otc such as compound-w/salicylic acid, or home remedies such as duct-tape, garlic juices may help. Consult doc for better topical meds, or get removal done in office with liquid nitrogen or electrodessication. Some docs use carbon-lasers for severe cases. These do spread to others and so be safe. Good luck.