I`ve looked through the posts and seen some possible answers.....
I used to be in the garage trade and suffered from blotches on my legs and i was told by the GP it was hair molucles getting blocked/infected on my legs etc, due to oils, chemicals etc from overalls.
I also get hot very quickly which does not help either with pores opening to let in chems!!
Ohhh the joys of getting older
Sounds like a trip to G.P