Here is my concern,
I get a red (rash look-a-like) spot on my penis head (glans penis). This rash is light red in colour, and appears always on the same spot (glans penis that is under the foreskin).

The redness appears only sometimes!!! It doesn't bother me, however sometimes it gives me a burning discharge when I pee.

Since this appearance is an untimely manner and very short lasting (usually half-a-day or maximum a day), I was wondering whether this could be an STD or if I should check with STD clinic.
Thanks.