its probably red
Scabies
Any changes or rashes on the penis should be investigated by a doctor.
If you have any spots or lesions on your penis or testicles, then you need to get it checked out by a doctor. It may mean that you have contracted an STD which needs to be treated.
this sounds like scabbies. I had it a long time ago when I caught it off my bed ridden grandfather. It is characterised by an itchy red rash where there is hair and white blisters where there are no hair follicles
Then he needs to go to his doctor to get it evaluated. It could be any number of bacterial or viral infections.
when you have a red and itchy weak eye it is called pink eye.
most un-neutered dogs will experience this. it is completely normal, he is excited, sexually. the "red crayon" is acually the penis, what you think is the penis is actually called the prepuce which is the sheath that covers the penis.
If the helix of the ear becomes red and itchy, this could be caused by an infection, trauma to the ear or an autoimmune disorder.
Blood flowing out of your penis. Your penis is a balloon.
allergy
It's a rash.
D