Purple/red coloring on penis?

There is a purple/red coloring on my boyfriends penis and there's red dots around it, like it looks like it is a brusie or rash but its not. There are no bumps or itchiness but it just appeared today. Could it be a rash or an allergic reaction or something of that nature?
He also might have poison ivy on it so the doctor gave him Desoximetasone cream to put on it. He may have put it on more than prescribed and scratched it a lot. Could it maybe be an allergic reaction from that or maybe he scratched it too hard?

[Vanessa Lacuesta]

Hi

When was this discoloration noted?

Did he take any medications or applied anything on the area before this rash appeared?

This appears like a bruise to me based on the image. It is violaceous in color,flat and there seems to be no redness or discharge in nearby areas. This may also be an abrasion on the skin secondary to an irritation or scratching of the skin. However, abrasions may present with a stinging pain.

The rash is still present even after application of medications. Have this assessed further by a urologist. A penile ultrasound may help determine if superficial blood vessels may be involved or if this is a localized skin condition without involvement of underlying structures.