Well I have just started getting black hairs on genitals and I am a VERY late bloomer as I am 16:). I have noticed my testicles have grown a bit and they are very "veiny"-are these a product of puberty? I'm a hypocondriact so am fixated on the fact I have testicular cancer although I dont think I do it's very irritating :(. Sometimes I mistake these veins as lumps, how can you tell if you have a cancerous lump? Would it keep growing?. Also my left testicle is bigger and hangs lower than my right! And how come my testicles change hardness throughout the day/week? thanks for your time :)