Wear shorts, to hell with what others may think.

Everyone is afflicted with something, ours just happens to be "heat bumps". I wear shorts when I'm not working, and I have had kids ask "what are those red bumps on your legs?". I tell them that it's from being in the heat, welding repairs on boat propellers for their family boat. They usually say thanks, or I get the occasional, "you should work faster". lol

Bottom line is this, don't let a "minor, cosmetic", medical condition that you have, run you. Just go be you, BTW I'm male, 40 and have dealt with this since I was about 20.