How do you clear clogged sweat glands?

After having a full body skin rash (called pityriasis rosea), I see that my sweat glands are clogged. Around my neck and upper back I have a prickly feeling when it's hot, and developed a rash at the base of my skull that might be a prickly heat rash. I find that I sweat more on my face, and don't have sweat on my chest and neck/back as I used to.
Do you have any suggestions what I should do to clear the clogged pores/glands?
The internet says to exfoliate and then put warm compresses. Does this make sense? Any other suggestions?